I was looking for a voucher. I don't ever do this for my flights but decided to try since my daughter was going with me on a business trip.

I didn't change fare classes. I expected a voucher and that is what I got both times but the second time was charged the change fee.

I understand the rational but I am not one that does this all the time. I tried it once and it was different from the second time.

I bought the ticket on my credit card to help my daughter out. I had been watching the fares and they had been low. All of a sudden they got high. I wanted to make sure that she was on the same plane so I bought the ticket. I don't think I did anything wrong.