# Telefonisches Erstgespräch 15 Minuten with Jessica Kirstein

> Das Erstgespräch (unverbindlich & kostenfrei) bietet dir die Möglichkeit, mich und meine Arbeitsweise kurz kennenzulernen, dein Anliegen zu schildern und erste Fragen zu klären. Gemeinsam besprechen wir, ob und welche therapeutischen Möglichkeiten für dich sinnvoll sein könnten. Wenn du anschließend eine ausführlichere Beratung wünschst, kannst du direkt einen weiteren Termin vereinbaren.

- Host: Jessica Kirstein
- Duration: 15 min
- Location: Attendee phone number
- Host time zone: Europe/Berlin
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/dr-jessica-kirstein/15min
- Event type id: 6892659

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=6892659&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": 6892659,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "location": {
    "type": "attendeePhone",
    "phone": "…"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address)
- 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.
- `location` is required: `location.phone` is the attendee’s own.