# Atlas sessions: first conversation with Leo Oosthuizen

> Fifteen minutes, five questions about the work that eats your week. We name the one bottleneck worth fixing first.

- Host: Leo Oosthuizen
- Duration: 15 min
- Location: Cal Video
- Host time zone: Africa/Johannesburg
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/omnimis/atlas
- Event type id: 7238327

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7238327&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": 7238327,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "bookingFieldsResponses": {
    "Company": "…",
    "WhatsApp-number": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `Company` (Company)
- Optional fields: `WhatsApp-number` (WhatsApp number)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.