I booked 2 tickets last night on NWA.com,

Ticket 1 = Used 25K miles for flight. Leaves MSP-STL today 7:19PM and STL-MSP on Sunday

Ticket 2 = CyberSaver ticket. Leaves MSP-STL today 7:19PM and returns Monday.

I screwed up and accidentally had the return flight for Monday on ticket 2, I wanted Sunday. My question is is that the person using ticket 1 is going to be driving back from STL with a friend so that ticket will go unused. Since I booked and paid for both flights is there some way I can get my name on the Sunday flight (ticket 1) that will not be used? Then I won't need the Monday flight.

Thanks