Telegram to Google Calendar Slot Finder (OpenAI + n8n)

Find available calendar slots from Telegram—automatically

This Telegram to Google Calendar Slot Finder (OpenAI + n8n) listens for date/time requests in Telegram (including voice notes), checks your Google Calendar FreeBusy availability for Europe/Berlin time, and replies back with open time slots—while logging every request to Google Sheets.

What this workflow does

• Triggers on Telegram updates: whenever a new message arrives in your Telegram bot.
• Handles voice notes with OpenAI: if the update is a voice note, the workflow downloads it and uses OpenAI transcription.
• Parses the scheduling request: OpenAI extracts a bounded date range, preferred time windows (in Europe/Berlin), and a minimum slot length.
• Looks up busy times in Google Calendar: it queries Google Calendar FreeBusy for the requested period.
• Computes free slots: busy intervals are merged, subtracted from requested windows, past times are excluded, and results shorter than the minimum slot length are filtered out.
• Replies in Telegram: availability is formatted by day and window.
• Audits activity in Google Sheets: each request/response is appended to a Google Sheets tab for traceability.

Use cases

• Let team members request meeting times via Telegram instead of manually checking calendars.
• Book availability for consulting calls by sending a voice note like “next week, mornings.”
• SaaS operators centralize scheduling support: customers ask for slots in Telegram, the workflow finds free times from Google Calendar.

Technical details

• n8n nodes: if, set, code, Telegram, Google Sheets, Sticky Note.
• OpenAI: transcription for voice notes and request parsing into date range + time windows.
• Google Calendar: FreeBusy queries for busy intervals.
• Time zone handling: time windows are interpreted using Europe/Berlin.

Built for n8n automation engineers and SaaS operators who want a fast, conversational calendar slot finder using Telegram, OpenAI, and Google Calendar.