At this point there's really not much to do until you get to the airport, where you can ask again at the check-in desks, and possibly plead your case. Not to sound unsympathetic, however, but check-in people have heard it all before, and they may not be able to seat you together without breaking up others. It isn't the end of the world, and people on the flight might be willing to swap.

Welcome to FT, curiouslystrong!