If you have a Lufthansa air ticket and wish to amend any travel itinerary, you can do so using the method, which allows any passenger to add/replace/change/upgrade a variety of items, including flight reschedules or adjustments.
Cancel your travel arrangements.
Request for reimbursement.
Change of name and date.
Upgrade or switch seating.
Baggage allowances are increased.
View the history of previous reservations.
Lufthansa Manage Booking allows you to schedule special and exquisite meals, among other things.