How do I get a paid seat assignment on LH? I booked UA ticket and converted UA code share flights to LH flight numbers (FRA-VCE and FCO-MUC) in December. When in LH app or on UA.com, there’s no ability to select seats. I’ve been successful in the past so I am figuring there has to be a way. LH 800 # has long wait time so I hung up after 20 minutes of nothingness.