Answer Customers Faster with AI · Lesson 3 of 7

Teach it your voice, and what stays out of the chat

20 minutes. Write one instruction, save it once, and every draft starts sounding like your business.

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Ask an AI assistant to "reply to this customer" with no other help and you'll get something polite, long and a little odd. "We're thrilled to assist you on your plumbing journey!" Nobody at Maple Street talks like that.

You fix this with a voice instruction: a short block of plain text that tells the AI how your business sounds, how replies end, and what it must never do. You write it once and save it in your AI tool, along with your answer bank, so you never paste it again.

If you took AI in 60 Minutes, its bonus lesson builds a fuller voice kit. This lesson is the customer-reply version: shorter, and built around the answer bank.

Part 1: Write the voice instruction (10 minutes)

Use the Reply Voice and Hand-Off Card template. It has a fill-in version of this. Here's Maple Street's, filled in:

> You draft replies to customer emails, texts and messages for Maple Street Plumbing & Heating, a small plumbing and heating company. A person on our team always reads, edits and sends every reply. You never send anything. > > Facts: Use only the facts in the attached Answer Bank. If the answer isn't in the Answer Bank, do not guess. Write [CHECK: what you need to know] in the draft so the person sees it. > > Tone: Friendly, plain and short. Talk like a helpful neighbor who knows plumbing. No exclamation points except in a thank-you. Never say "thrilled," "delighted," "journey" or "valued customer." > > Length: Three to six sentences for email. One to three sentences for texts. > > Structure: Answer the question in the first sentence. Then the one next step (book, call, send a photo). Then the sign-off. > > Sign-off: "Thanks, Rosa, Maple Street Plumbing & Heating, (555) 010-0199." (Fictional number.) > > Never promise: arrival times, prices for unseen work, warranty or insurance coverage, refunds or discounts. Follow every "Never promise" note in the Answer Bank. > > Hand to a person: If the message is angry, mentions a refund, a billing dispute, damage, a lawyer, an injury, a health concern, or anything you're unsure of, do not draft an answer. Write "HAND OFF:" and one line saying why.

Write yours the same way. Three tips:

  • Paste two or three real replies you were proud of at the end, with customer details removed, labeled "Examples of our tone." The AI copies what you show it.
  • List your banned words. Every business has a few. If you hate "per our policy," say so.
  • Say who sends. "A person always sends" belongs in the first lines. It reminds the AI, and anyone reading the instruction, how this works.
Part 2: What never goes into the chat

The voice instruction and answer bank stay in your AI tool. So will the customer messages you paste in. Before you paste anything, here's the rule for your whole team.

Never paste these into an AI chat:

  • Card numbers, bank account numbers, or anything from a payment
  • Social Security numbers, driver's license numbers or other ID numbers
  • Passwords, door codes, alarm codes, Wi-Fi keys
  • Health details (diagnoses, medications, treatment, insurance member IDs). This matters most for clinics and anyone in health care. Unless your IT partner has confirmed in writing that your AI plan is set up for health information (in the US, that usually means a signed business associate agreement), keep it out completely.
  • Anything a customer told you in confidence that isn't needed to answer the question

What you can paste: the question itself. Before pasting, delete names, addresses, phone numbers and account numbers you don't need. "Customer asks if we can replace a 10-year-old gas water heater this week" works as well as the full email with signature.

Part 3: Use a company account, not a personal free one

Customer messages are business information. Put them in a business account.

  • Use a work plan your business pays for and controls: Claude Team or Enterprise, ChatGPT Business or Enterprise, Microsoft 365 Copilot through your Microsoft 365 business account, or Gemini through your Google Workspace business account.
  • Why it matters: on these business plans, the vendors' own pages say your conversations are not used to train their models by default. Anthropic says so for Team and Enterprise. OpenAI says so for ChatGPT Business and Enterprise. Microsoft says Copilot prompts and responses aren't used to train its foundation models. Google says a business's Workspace data isn't used to train Gemini models. Personal and free plans have different rules, and you often have to find the setting yourself.
  • Why else it matters: if Rosa leaves, the saved instruction and answer bank stay with the business, not in her personal account.

If you're a one-person business on a personal plan for now, open its privacy or data settings, read what it says about training, and choose the most private option. Then plan to move to a business plan when you can.

Part 4: Save it in your tool (5 minutes)

Each tool has a place to save standing instructions and files so you don't paste them every time. Make one called Customer Replies.

  • Claude: create a Project. Add the voice instruction as the project's instructions and upload your answer bank as a file. Projects are available on all plans, including Free (Free accounts can make up to five).
  • ChatGPT: create a Project. Open the project's ... menu, choose Project settings, and add the voice instruction there. Upload the answer bank as a project file. Project instructions apply only inside that project.
  • Gemini: create a Gem. Choose Explore Gems, then New Gem. Paste the voice instruction as its instructions, then add the answer bank under Knowledge with Add files. Click Save (previewing doesn't save it).
  • Microsoft 365 Copilot: build an agent with Agent Builder. Select New agent, then Skip to configure. On the Configure tab, paste the voice instruction under Instructions (there's an 8,000-character limit, which is plenty) and add the answer bank under Knowledge (an uploaded file, or the document's SharePoint or OneDrive location). Test it on the Try it tab. Which knowledge sources you can add depends on your license. If you don't see New agent, ask your admin or IT partner.

Going deeper on saved instructions and sharing them with your team is the subject of Save Your Best Instructions: Projects, GPTs and Skills.

When the answer bank changes, replace the file in your project, Gem or agent. An old file means old prices in your drafts.

Do this now
  • Fill in the voice section of the Reply Voice and Hand-Off Card.
  • Save it, with your answer bank, as a Customer Replies project, Gem or agent in your tool.
  • Test it. Paste in one real customer question (details removed) and ask for a reply.

Check it worked

  • The test draft answered in the first sentence, used a fact from your answer bank, and ended with your sign-off.
  • It used none of your banned words.
  • Now paste a question that is not in your answer bank. The draft should say [CHECK: ...] instead of making up an answer. If it guessed, add this line to the top of your instruction and test again: "If a fact is not in the Answer Bank, you must write [CHECK] instead of answering."

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Next: you have a tool that drafts well. Now build the routine that makes sure a person checks every draft.

→ Lesson 4: Draft, check, approve: the daily routine

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