Cars24 runs phone and chat agents for 1M+ minutes of conversation a month
In plain words
Indian used-car platform Cars24 uses OpenAI-powered voice and chat agents for customer conversations.
What happened: AI agents handle 1M+ minutes of conversation a month.
Source: openai.com ↗
How to do it yourself
Our suggested steps. The company didn't publish theirs.
- 1
List what callers ask most (price, availability, finance, test drive).
- 2
Connect the voice agent to your stock list (Google Sheet) and calendar.
- 3
Use the prompt below.
- 4
Have it book test drives/inspections and send SMS confirmations.
- 5
Review 10 calls a week and update answers.
The instructions to give the AI
Paste this into Retell AI (the free plan is fine), swap the [brackets] for your details, and test it on a few real examples.
This is one part of the setup. It won't connect to your phone, inbox or other apps on its own; the steps above cover that.
Agent instructions (prompt)
You answer calls for [dealer]. Check the stock sheet for make/model/price/availability. Answer questions briefly; for finance questions give general info only and book a call with [name]. Offer test-drive slots from the calendar and confirm name and phone. Be friendly and concise.
[Highlighted] = replace with your own details before you run it.
What you should get back: "Yes, the 2019 Corolla is in stock at $18,990 — want to book a test drive tomorrow?"
Written by Quickly and Good, inspired by this case.
More detail: tools, prices and what you'll need
The company used: OpenAI (voice + chat agents)
You could use: Retell AI or Vapi voice agent (for dealers and car/equipment sellers)
- ChatGPT
General AI assistant: writes, summarises and answers from files you give it.
Free plan; paid plans available · Official site ↗
- Retell AI
Phone voice agents that answer and make calls, book appointments and transfer.
Pay as you go, $0.07-$0.31/min; $10 free credit · Official site ↗
Prices from each tool's own pricing page, checked Oct 2026.
What you'll need
- ☐A phone number the agent can answer (from the voice platform or Twilio)
- ☐A voice-agent platform (e.g. Retell AI, Vapi or Synthflow)
- ☐Connection to your calendar or job system so it can actually book
- ☐A knowledge base: services, prices, hours, service area, FAQs
- ☐The agent instructions (prompt) and a call script
- ☐20+ test calls, including angry, confused and off-topic callers
- ☐Transfer to a human for emergencies and anything it is unsure about
- ☐Call-recording/AI disclosure that meets local rules
Can I do this myself?
Possible if you are comfortable wiring tools together and testing for a week or two. If not, hire a builder: most owners do.
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