curl --request POST \
  --url https://api.sanka.com/v1/public/calendar/attendance/{attendance_id}/cancel

{
  "status": "<string>",
  "message": "<string>",
  "ok": true,
  "attendance": {
    "id": "<string>",
    "event_id": "<string>",
    "user_name": "<string>",
    "user_email": "<string>",
    "select_date": "<string>",
    "time_event": "<string>",
    "timezone": "<string>",
    "comment": "<string>",
    "link": "<string>",
    "calendar_event_id": "<string>"
  },
  "meet_link": "<string>",
  "ctx_id": "<string>"
}