# Lee O'Bryan – Cal.com booking page

> O'Bryan Systems helps Civil Engineers wisely adopt AI. We target simple uses of AI to help engineers gain more control over computers.

Booking page: https://cal.com/lee-obryan

## Event types

- [30 min meeting](https://cal.com/lee-obryan/30min): 30 min, confirmed instantly, event type id 6337979. Details: https://cal.com/lee-obryan/30min.md
- [15 min meeting](https://cal.com/lee-obryan/15min): 15 min, confirmed instantly, event type id 6337977. Details: https://cal.com/lee-obryan/15min.md

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=<event type id>&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

Each event type's `.md` document lists its required booking fields and the `POST https://api.cal.com/v2/bookings` request (`cal-api-version: 2026-02-25`).

## More

- API docs: https://cal.com/docs/api-reference/v2/introduction