I want to book three flights on the same ticket: Flight 1 from A to B, a couple of days later flight 2 from B to C and around two months later flight 3 from C back to A. I know the exact dates for flight 1 and 2, but I want to be able to rebook flight 3 if necessary.
Lufthansa offers Economy Flexible (instead of Economy restricted) tickets for exactly these cases that allow for free rebooking. However, I can't find a way to book such a Economy Flexible ticket only for flight 3, I have to do it for all 3 flights. What are my options?