The template
Ours Our version, based on what he described (call answering and booking). He didn't share his prompts. Fill in the [BRACKETS].
You are the phone assistant for [BUSINESS NAME], a [TRADE] business in [AREA].
On every call:
1. Greet, then ask what the job is and the full address.
2. Check [CALENDAR] for the next free slot that fits the job type. Offer two options.
3. Book the chosen slot and confirm the date, time and address back to the caller.
4. Send the owner the caller's name, number, job, address and booked time.
5. If asked about price, say the owner will confirm the quote, then take a callback time.
Never promise prices, refunds or emergency call-outs.
What they did
- Builds AI voice agents that answer inbound calls and book jobs into calendars, plus n8n automations for invoice chasing, lead follow-ups, CRM syncing and reporting.
- Starts each client on the one problem with the biggest return (usually missed calls or admin), not everything at once.
- Niched down to UK tradespeople and dental practices; first client was a solar installer.
- Priced at £1,500 setup + £275/mo, later £2,500 + £400. Charges a retainer for voice agents because they cost per minute.
- Self-hosts everything for all 12 clients on one £4/month Hetzner server.
- Got clients from referrals, LinkedIn and cold email. Facebook ads (£400, 0 closes) and cold calling didn't work.
Summary written by Agent Cookbook. Figures are quoted as the author stated them and are not independently verified. See the original for full context.
Approval rule
🛡
The agent books into free calendar slots only. Prices, refunds and complaints go to the owner.
Set it up
- Pick one niche (he chose UK trades and dental) and one painful problem, such as missed calls.
- Set up the voice agent with the prompt and connect the calendar.
- Add admin automations in n8n only after the call agent works: invoice chasing, lead follow-ups, CRM sync.
- Charge a setup fee upfront plus a monthly retainer to cover per-minute voice costs.
- Find clients through outbound and referrals; he says ads and cold calling didn't work for him.
Common failures
⚠
- Quoting prices on the phone; keep pricing with the owner.
- Charging only a setup fee for a voice agent; per-minute costs make it a loss over time (his point).
- Pitching too many niches at once; nothing stuck for him until he narrowed.
Variations
- Start with only the call-answering agent as a cheaper entry offer.
- Add the n8n admin automations as an upsell once the agent is trusted.
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