I'm a bit confused with Lufthansa's policies. I have a YOW-LHR, DUB-YUL flight in September on Air Canada but booked with Lufthansa stock. Can I change or reschedule my trip if things are still bad closer to my trip? Ideally, I'd like to make it a YOW-LHR, LHR-YOW or YUL ticket to make it easier.