I accidentally chose my seats which ended on a charge of 90 dollars extra for my flight. I was annoyed by this but it was my mistake. I called to fix this thinking i would spend a long time on the pohne explaning this and what not. To my surprise, the lady i talked to was super nice and they fixed the issue very quickly! I figured the answer would be "you have to cancel the flight and re-book it" but in a matter of minutes it was all fixed!