We did our FPs at the ASC on Northwest highway near Marsh/Lemmon and the back of Love Field.
Our FP notices said something like "if you can't make the appointment, send this notice back with a reason and a better time". My daughter couldn't make her (GC renewal) appointment because of a conflict with her year-end exams (her GC ran out midway through our Natz processing). We followed the instructions. About a week or two later, we got a new appointment that respected our "these are the best times" list.
Of course, we copied the notice and send it certified with return receipt. But, we were very happy with the outcome.
All of our FP appointments ended up on Saturdays (both Natz and GC renewal). We each waited about 1 to 1.5 hours after the appointment's time (nothing in USCIS land).
Our FP notices said something like "if you can't make the appointment, send this notice back with a reason and a better time". My daughter couldn't make her (GC renewal) appointment because of a conflict with her year-end exams (her GC ran out midway through our Natz processing). We followed the instructions. About a week or two later, we got a new appointment that respected our "these are the best times" list.
Of course, we copied the notice and send it certified with return receipt. But, we were very happy with the outcome.
All of our FP appointments ended up on Saturdays (both Natz and GC renewal). We each waited about 1 to 1.5 hours after the appointment's time (nothing in USCIS land).