# Yui Ops Fit Call with Daniel Zimmer

> 15 minutes, no pitch. Tell us where your office is losing time between systems and chasing information, and we'll tell you honestly whether we can help.

- Host: Daniel Zimmer
- Duration: 15 min
- Location: Cal Video
- Host time zone: America/Los_Angeles
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/yuiops/fit-call
- Event type id: 5757084

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=5757084&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": 5757084,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "attendeePhoneNumber": "…",
    "biggest-headache": "…",
    "business-description": "…",
    "annual-revenue": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `attendeePhoneNumber` (Phone number), `biggest-headache` (What's the biggest operational headache right now?), `business-description` (What does your business do?)
- Optional fields: `guests` (Add guests), `annual-revenue` (Approximate annual revenue?)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.