I have tickets for a Lufthansa flight (AUS - STR), and there was a schedule change. My travel agent says she can't reissue the tickets because their office uses Sabre, and Lufthansa uses Amadeus. Because of this, she said the tickets have to be reissued by Lufthansa.
This is curious, as my travel agent initially issued the tickets.
Does this make sense, or is my travel agent being lazy?