def _cancel_reservation(self, reservation_id: str):
        """Cancel a reservation.

        This will only work for reservations inside the processor's
        schedule freeze window.  If you are not sure whether the reservation
        falls within this window, use remove_reservation
        """
        return self.context.client.cancel_reservation(
            self.project_id, self.processor_id, reservation_id
        )
Cancel a reservation.

        This will only work for reservations inside the processor's
        schedule freeze window.  If you are not sure whether the reservation
        falls within this window, use remove_reservation
        
cirq-google/cirq_google/engine/engine_processor.py