json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "type": "object",
      "additionalProperties": false,
      "properties": {
          "booking_reason": {
              "type": "string"
          },
          "slots": {
              "type": "array",
              "description": "List of slots representing the start/end date of the bookings",
              "additionalProperties": false,
              "items": {
                  "type": "object",
                  "properties": {
                      "start_date": {
                          "description": "Unix timestamp representing the start date of the booking",
                          "type": "integer"
                      },
                      "end_date": {
                          "description": "Unix timestamp representing the end date of the booking",
                          "type": "integer"
                      },
                      "iana": {
                          "description": "IANA identifier of the booking owner",
                          "type": "string"
                      }
                  },
                  "required": [
                      "start_date",
                      "end_date",
                      "iana"
                  ]
              },
              "maxItems": 1
          }
      },
      "required": [
          "slots"
      ]
  }