# Introductory call with Speak with Sebastian

> A free 15-minute video call with Sebastian. We talk about your goals, your level and when you would like to have lessons. Already bought a package? Book this call and we'll plan your first lesson together. Lessons are for adults (18+).

- Host: Speak with Sebastian
- Duration: 15 min
- Location: Google Meet
- Host time zone: Europe/Lisbon
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/speakwithsebastian/intro-call
- Event type id: 7817883

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7817883&start=YYYY-MM-DD&end=YYYY-MM-DD&timeZone=<IANA time zone>
cal-api-version: 2024-09-04
```

The response is `{"data":{"YYYY-MM-DD":[{"start":"<ISO 8601 with offset>"}]}}`; no API key is needed.

## Book

```http
POST https://api.cal.com/v2/bookings
cal-api-version: 2026-02-25
Content-Type: application/json

{
  "eventTypeId": 7817883,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "bookingFieldsResponses": {
    "learn": "…",
    "purchased": "…",
    "adult": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `learn` (Which language would you like to learn?), `purchased` (Have you already bought a lesson package?), `adult` (I confirm I am 18 or older)
- Optional fields: `notes` (Additional notes)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.