# Free 15-minute consultation with Cassandra

> Free, 15-minute, no-obligation call to discuss your business, financial challenges, and how Casbren Financial Solutions can help. Please be ready to share a brief business overview, your top concerns, and any questions. By the end of the call, you’ll know if we’re a good fit and possible next steps. I look forward to speaking with you!

- Host: Cassandra
- Duration: 15 min
- Location: Zoom Video, +14698440415
- Host time zone: America/Chicago
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/casbren/15min
- Event type id: 4439227

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=4439227&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": 4439227,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "title": "…",
    "attendeePhoneNumber": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `title` (What would you like to discuss?)
- 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.
- `location` is optional; without it the booking uses the event’s first location.