# Erstgespräch | Conversion System with Johannes Unterkofler

> Dieses Gespräch ist für Hotels gedacht, die Direktbuchungen strategisch und messbar steigern wollen. Wir prüfen, ob Struktur, Timing und Anspruch zusammenpassen und entscheiden gemeinsam, ob ein nächster Schritt sinnvoll ist.

- Host: Johannes Unterkofler
- Duration: 30 min
- Location: Google Meet
- Host time zone: Europe/Vienna
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/johannesunterkofler/erstgesprach-conversion-system
- Event type id: 4662737

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=4662737&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": 4662737,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "bookingFieldsResponses": {
    "Position": "…",
    "Hotelname": "…",
    "Website": "…",
    "Wie-viele-Zimmer-hat-das-Hotel": "…",
    "Welche-Kategorie-trifft-am-ehesten-zu": "…"
  }
}
```

- Required fields: `name` (Your name), `Position` (Position), `email` (Email address), `Hotelname` (Hotelname), `Website` (Website), `Wie-viele-Zimmer-hat-das-Hotel` (Wie viele Zimmer hat das Hotel?), `Welche-Kategorie-trifft-am-ehesten-zu` (Welche Kategorie trifft am ehesten zu?)
- Optional fields: none
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.