# Free 30-min AI call with Fourth Street AI with Oliver MacDonald

> Thirty call to see where AI fits in your business and how we can help. We’ll start with what we build (AI agents, custom AI tools, automations, and advisory) and share examples from businesses like yours. If you already have a problem in mind, we’ll go straight to the work you want handled, the systems it touches, and what a good result looks like. You’ll leave knowing which service fits and what a first project would include.

- Host: Oliver MacDonald
- Duration: 30, 45, 60 min
- Location: Google Meet
- Host time zone: America/Denver
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/olivermacd/30-min-fourth-street-ai
- Event type id: 7915473

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7915473&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": 7915473,
  "start": "<UTC ISO 8601 start from the slots response>",
  "lengthInMinutes": 30,
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "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.
- `lengthInMinutes` picks one of 30, 45, 60; pass the same value to the slots request as `duration`.