# Three-Hour Intensive Session with Billy

> For those seeking a truly immersive and transformative experience, the 3-hour intensive strategy session is the ultimate option. This session is for those who want to have a session that transforms things. We will jump into an aspect of your business, and through advising, demonstrations, and hands-on assistance see actual change. Whether you're looking to overhaul your digital presence, create a new product or service, implement a major process improvement, or build digital assets this session offers the time and focus necessary to make significant progress. Expect to leave with a clear roadmap, practical tools, and the confidence to take your business to new heights.

- Host: Billy
- Duration: 180 min
- Location: Zoom Video
- Host time zone: America/Chicago
- Confirmation: Bookings are confirmed instantly.
- Payment: required, and collected on the booking page.
- Booking page: https://cal.com/askbilly/three-hour-intensive-session
- Event type id: 3004314

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=3004314&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": 3004314,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `notes` (Please provide a brief synopsis of what you would like to discuss or what I can help you with.)
- Optional fields: `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.