curl --request DELETE \
  --url https://api.cal.com/v2/teams/{teamId}/users/{userId}/ooo/{oooId} \
  --header 'Authorization: <authorization>'

{
  "status": "success",
  "data": {
    "userId": 2,
    "id": 2,
    "uuid": "e84be5a3-4696-49e3-acc7-b2f3999c3b94",
    "start": "2023-05-01T00:00:00.000Z",
    "end": "2023-05-10T23:59:59.999Z",
    "toUserId": 2,
    "notes": "Vacation in Hawaii",
    "reason": "vacation"
  }
}