# Erstgespräch with Simon Zink

> Im Erstgespräch besprechen wir deinen Hintergrund und deine Ziele, klären, wie TA Höhenluft dich unterstützen kann, und prüfen gemeinsam, ob eine Zusammenarbeit sinnvoll und umsetzbar ist. Wenn nicht, kommt es zu keinem Abschluss.

- Host: Simon Zink
- Duration: 15 min
- Location: Cal Video
- Host time zone: Europe/Vienna
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/ta.hoehenluft/erstgesprach
- Event type id: 3045138

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=3045138&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": 3045138,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "attendeePhoneNumber": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address)
- Optional fields: `attendeePhoneNumber` (Phone number), `notes` (Additional notes), `guests` (Add guests)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.