AN update API with clearly defined actions on entity

ActionDefinedUpdateApi.java

public class Booking {
	String uniqueId;
	User guest;
	User host;
	Date bookingTime;
	Date confirmationTime;
	Date cancellationTime;
	Status status; //PENDING, CONFIRMED, CANCELLED_BY_GUEST, CANCELLED_BY_HOST
	User lastUpdatedBy;
}
public class BookingUpdateRequest {
	AllowedActionOnBooking action;
	Date updateTime;
	Booking updatedBooking;
}
// Explicitly define the ways of modiying the Booking entity
public enum AllowedActionOnBooking {
	GUEST_CANCELLATION,
	HOST_CANCELLATION,
	CONFIRM,
	DATE_CHANGE
}
// In Booking Service
public void updateBooking(BookingUpdateRequest request) {
	Booking originalBooking = readFromDB(request.updatedBooking.uniqueId);
	switch (request.action) {
		case GUEST_CANCELLATION:
			handleGuestCancellationRequest(originalBooking, request);
			break;
		case HOST_CANCELLATION: 
			handleHostCancellationRequest(originalBooking, request);
			break;
		case CONFIRM:
			handleConfirmationRequest(originalBooking, request);
			break;
		case DATE_CHANGE:
			handleDateChangeRequest(originalBooking, request);
			break;
		default: throw new Exception("Unhandled action on booking");
	}
}

// Or move all these private methods to their own handler simplifying this class further
private void handleGuestCancellationRequest(Booking originalBooking, BookingUpdateRequest request) {
	originalBooking.lastUpdatedBy = originalBooking.guest;
	originalBooking.cancellationTime = cancelltaionTime;
	originalBooking.status = CANCELLED_BY_GUEST;
	// Trigger notification to host
	// Trigger refund if payment was taken
	updateInDB(originalBooking);
}
private void handleHostCancellationRequest(Booking originalBooking, BookingUpdateRequest request) {
	originalBooking.lastUpdatedBy = originalBooking.host;
	originalBooking.cancellationTime = cancelltaionTime;
	originalBooking.status = CANCELLED_BY_HOST;
	// Trigger notification to guest
	// Trigger refund if payment was taken
	updateInDB(originalBooking);
}
private void handleConfirmationRequest(Booking originalBooking, BookingUpdateRequest request) {
	// Business logic
}
private void handleDateChangeRequest(Booking originalBooking, BookingUpdateRequest request) {
	// Business logic
}