You cancel your flight and your ticket is non-refundable.
You receive an upgrade from Lufthansa for operational reasons or as a gesture of goodwill.
You change your seat, but the new seat is cheaper than the one you originally booked or is free of charge.
You do not satisfy the conditions for sitting in an emergency exit row.
You rebook your flight, but there are no longer equivalent seats available on the new flight, seat reservations on the new flight are free of charge or this flight is not operated by Lufthansa, Lufthansa Regional or Austrian Airlines.
You change your flight and in the process change the routing.