no problem at all. you could call your friend who works for delta and ask him or her to make the change in your listing. But, if you don't want to bother with that, here is what I would do: I would just go to the airport on the day I wanted to travel, and go to the desk and ask them to change your listing. they'll be able to find your reservation with your confirmation code, and then list you on the day you want to leave. Give yourself an extra 30 min to do it. Should be painless.