curl --request PATCH \
  --url https://api.staging.kathan.tech/phone-numbers/{phone_number_id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-User-ID: <api-key>' \
  --data '
{
  "label": "<string>",
  "assistant_id": "<string>"
}
'

{
  "id": "<string>",
  "provider": "<string>",
  "phone_number": "<string>",
  "status": "<string>",
  "label": "<string>",
  "created_at": "<string>"
}