After we had got online our check in and seat numbers, once in de Gaulle Airport we were warned that we would lose our flight because of an "overbooking". Despite I tried to explain the company crew that we already had our seats asigned, they insisted that we let all the passengers in and then would see if there would be two places for us. Finally, after three awful hours waiting, when the aircraft had almost departed, my wife and me were allowed to fly that night, in separate seats, of course. Therefore I strongly recommend all Air France future passengers to get the airport and drop off their baggage as soon as possible.