Keep trying, we could not get it at first and then got a ridiculously late time, but then a nice disser gave me her dinner at a perfect time! So, I canceled my late time! People seem to change all the time, you just have to keep checking and do it online and on phone- you may get lucky!
Last year, we wanted Chef Mickey's for breakfast and could not get in, I called and called and called and CALLED, then on the day before we really wanted to go, we called again and GOT IT!
So, there is hope!