# Voice to calendar booking with OpenAI and Google Calendar: n8n workflow

> Started by an incoming Telegram message, and works across Google Calendar and Telegram. It hands the judgement calls to OpenAI.

Source: https://millionrounds.com/workflow/voice-to-calendar-booking-with-openai-and-google-calendar (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [Scheduling](https://millionrounds.com/workflows?category=Scheduling#library)

# Voice to calendar booking with OpenAI and Google Calendar

Started by an incoming Telegram message, and works across Google Calendar and Telegram. It hands the judgement calls to OpenAI. 15 steps, 3 branches: a working afternoon to understand properly.

Medium Calls a model: OpenAI

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fvoice-to-calendar-booking-with-openai-and-google-calendar)

**15 steps** Medium: a working afternoon

**3** Branches: places the flow splits

**0** Loops or waits

**2** Services it connects to

## The flow

Starts it 1 Model 2 Logic 7 Service 5

The steps in the order they run, from what starts it.

- 1 **Telegram Trigger** Telegram trigger *Starts it*
- 2 **Check for Commands** If *Logic*
- 3 **Send Help** Telegram *Service*
- 4 **Voice or Text?** If *Logic*
- 5 **Download Voice** Telegram *Service*
- 6 **Format Text Data** Set *Logic*
- 7 **Voice to Text** Open Ai *Model*
- 8 **Merge Voice & Text** Merge *Logic*
- 9 **Format Voice Data** Set *Logic*
- 10 **Extract Meeting Details** Open Ai *Model*
- 11 **Parse Meeting Data** Code *Logic*
- 12 **Success?** If *Logic*
- 13 **Create an event** Google Calendar *Service*
- 14 **Send Error Message** Telegram *Service*
- 15 **Send Success Message** Telegram *Service*

## How it's built

- **Starts on:** An incoming Telegram message
- **Steps:** 15, with 3 branches
- **Size:** Medium: a working afternoon
- **Connects to:** Google Calendar, Telegram
- **Model:** OpenAI

## Questions

What does it need to run?

An n8n account, plus your own Google Calendar and Telegram accounts, and a key for OpenAI. You connect your own accounts after importing it; none are included.

What starts it?

It starts on an incoming Telegram message.

Does it use AI?

Yes. It calls OpenAI. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Plan an afternoon. 15 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

**Before you run it**

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 15 steps before you point it at anything that matters.

## Run it in n8n

- **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n)
- **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fvoice-to-calendar-booking-with-openai-and-google-calendar)
- **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts.

Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind.

## Connects to

Each opens the other workflows that use it.

[Google Calendar](https://millionrounds.com/workflows?service=Google+Calendar#library)[Telegram](https://millionrounds.com/workflows?service=Telegram#library)

## Workflows like it

Also scheduling, with the same services where possible, closest in size first.

- [**AI-powered productivity coach with Google Calendar and Todoist** 15 steps · calls a model · Google Calendar, Google Sheets](https://millionrounds.com/workflow/ai-powered-productivity-coach-with-google-calendar-and-todoi)
- [**Angie, personal AI assistant with Telegram** 15 steps · calls a model · Gmail, Google Calendar](https://millionrounds.com/workflow/angie-personal-ai-assistant-with-telegram)
- [**Automate meeting Nexus preparation with OpenAI** 15 steps · calls a model · Google Calendar, Notion](https://millionrounds.com/workflow/automate-meeting-nexus-preparation-with-openai)
- [**Build a personal assistant with Gemini and Gmail** 15 steps · calls a model · Gmail, Google Calendar](https://millionrounds.com/workflow/build-a-personal-assistant-with-gemini-and-gmail)
- [**Chat with OpenRouter and Google Sheets** 15 steps · calls a model · Google Sheets, Telegram](https://millionrounds.com/workflow/chat-with-openrouter-and-google-sheets)
- [**Handle Spanish-speaking vet clinic bookings with OpenAI** 15 steps · calls a model · Gmail, Google Calendar](https://millionrounds.com/workflow/handle-spanish-speaking-vet-clinic-bookings-with-openai)