Retell/Cal.com Customer Email Issue
  • Problem:
My Retell AI agent books appointments via Cal.com API. Only the admin (calendar owner) gets booking notifications, but the customer gets nothing. Plus the email field in Cal.com is empty - only shows first name.
  • Current Flow:
Retell call → captures customer email as dynamic variable → books on Cal.com → logs to Google Sheets → only admin gets notified
  • The Issue: I don’t think Retell is passing the email dynamic variable from the batch call/Google Sheets back to Cal.com during booking. The Cal.com booking only shows the customer’s first name, email field is empty.
  • Need:
Customer confirmation emails and reminders using the email captured in Retell dynamic variables/batch calls and logged in Google Sheets.
  • Questions:
1. How to pass email dynamic variable from Retell/Google Sheets to Cal.com during booking?
2. Should I trigger customer emails separately through n8n using the Google Sheets data?
3. Best way to handle reminder sequences when Cal.com doesn’t have the customer email?
  • Tech Stack: Retell (dynamic variables), Cal.com API, Google Sheets, n8n, Gmail
Anyone solved this before? Looking to improve appointment show-up rates.
Thanks!
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Nikol Hayes
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Retell/Cal.com Customer Email Issue
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