# Roofing Business Builder — Qualifying Call with Daniel Lakstins

> Let's discuss your roofing business and where you want to take it next. During this qualifying call, we'll talk about your current business, your goals for growth, and whether Roofing Business Builder can help you expand into commercial roofing and build a stronger, more profitable business. Choose a time that works for you, and let's explore what's possible.

- Host: Daniel Lakstins
- Duration: 30 min
- Location: Cal Video
- Host time zone: America/Chicago
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/daniel-lakstins/roofing-business-builder-qualifying-call
- Event type id: 7415307

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7415307&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": 7415307,
  "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)
- 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.