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Retell AI, Vapi, Synthflow, WhatsApp BusinessSpice Kingdom

A restaurant captures catering leads in English, Punjabi and Hindi

In plain words

Spice Kingdom kept fumbling big catering calls in three languages. A multilingual AI now answers, captures every catering request and sends it to WhatsApp.

What happened: Catering leads up 340%, about $44K more catering revenue a month.

Source: inputly.ai ↗

⏱ About 1-3 weeks to set up🎓 Comfortable with no-code toolsEasier with a builder's help

How to do it yourself

Our suggested steps. The company didn't publish theirs.

  1. 1

    Count how many calls you miss a week (check your phone log).

  2. 2

    Write down your prices, service area and what counts as an emergency.

  3. 3

    Set up the voice agent, connect WhatsApp and a Google Sheet for leads, and paste the prompt below.

  4. 4

    Call it 20 times yourself pretending to be different customers.

  5. 5

    Switch it on after hours first, then for overflow during the day.

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 the phone for [business], a restaurant that does catering. Find out what the caller needs, where they are and how urgent it is. Quote only these standard prices: [list]. Book them into a free slot in the calendar and confirm by text. If it's an emergency ([define]), text [owner phone] right away. If you're not sure, take a message. Keep it short and friendly.

[Highlighted] = replace with your own details before you run it.

What you should get back: "Spice Kingdom catering — for 50 guests on the 14th, can I take your name and number for a quote?"

Written by Quickly and Good, inspired by this case.

More detail: tools, prices and what you'll need

The company used: Retell AI, Vapi or Synthflow voice agent

You could use: Retell AI, Vapi or Synthflow voice agent + WhatsApp and a Google Sheet for leads

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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