# Kostenloses Erstgespräch with Daniel Lustig

> Du überlegst, mit Coaching zu starten? In einem kurzen Telefonat klären wir dein Ziel, deine Ausgangslage und ob mein Coaching zu dir passt. Unverbindlich und kostenlos – ich rufe dich zum gebuchten Zeitpunkt an.

- Host: Daniel Lustig
- Duration: 20 min
- Location: Phone call
- Host time zone: Europe/Vienna
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/fdc-termin/kostenloses-erstgesprach
- Event type id: 7617155

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7617155&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": 7617155,
  "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), `attendeePhoneNumber` (Telefonnummer)
- Optional fields: `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.