docs: def cancel_ride(self, ride_id, cancel_confirmation_token=None):
          """Cancel an ongoing ride on behalf of a user.
          Params
              ride_id (str)
                  The unique ID of the Ride Request.
              cancel_confirmation_token (str)
                  Optional string containing the cancellation confirmation token.
          Returns
              (Response)
                  A Response object with successful status_code
                  if ride was canceled.
          """
          args = {
              "cancel_confirmation_token": cancel_confirmation_token
          }
          endpoint = 'v1/rides/{}/cancel'.format(ride_id)
          return self._api_call('POST', endpoint, args=args)