I fly vietnam airline from ho chi minh to singapore. When u check in I reconfirn aile seat staff said yes!! However when i got on the plane my seat was changed to window seat. As I was the last person to board due to lost boarding pass I ask a lady crew to help me find a space to keep my luggage she saud it is not her job !! She was so rude ! This was first and last time i fly with this airline.