I am trying to make a change to an existing itinerary, because according to the CO website, seats opened up on a earlier flight on the same day (BRU-ATH), which would give me a couple extra hour in Athens. Called two separate agents, and they both said they only see one seat open (I need 2, and CO.com search reflects 2 available seats. In fact I can get up to 4 seats). If the phone agents cannot see availability, is there anything I can do, or am I SOL? I am not on hold waiting for CO.com support to see if they do anything, but I am not holding my breath.