Call and see...
Yup, guy is doing it via chat now. Thanks!
This is still a backup plan that will likely get cancelled...
ETA: Even though I know I'm 85% likely to cancel, this is a real DDFer story. Travel waiver is only until 12/15 and I needed 12/16 so I told the rep to book me on the 12/15 flight leaving 9pm. Turned out he booked me on the flight
arriving 9pm so I reached out again and explained the situation and requested a change to 12/16 if possible, moments later it was confirmed.