Send AI lead follow-up SMS with GPT-4.1, Google Sheets, Twilio and Gmail

Description

How it works
Triggered when a lead submits your website contact form via webhook
Logs the lead's Name, Phone, Email, and Interest to Google Sheets
GPT-4.1 generates a personalised SMS and sends it instantly via Twilio
Waits 2 hours, then checks if the lead has replied (via Google Sheets)
If replied: notifies you via Gmail. If not: sends an AI follow-up SMS

Set up steps
Add your OpenAI API key to both OpenAI nodes (model: GPT-4.1)
Connect your Twilio account (Account SID + Auth Token) in both SMS nodes
Link Google Sheets via OAuth and set your sheet with columns: Name, Phone, Email, Interest, Replied
Connect Gmail via OAuth for owner notifications
Paste the webhook URL into your website contact form as the POST endpoint
Manually update the Replied column to Yes in Google Sheets when a lead responds