Last year (around August) I changed my availability request, I made myself available to close every day except Monday and Tuesday which I'm only available until 6 pm. The request was approved and for a long time it was honored. Recently (about 2 months or so) I've been getting scheduled off and on to close Monday or Tuesday nights. I've been swapping those shifts and I've been telling the ETL in charge of scheduling that I'm not available yet it keeps happening over and over again. I got scheduled again to close next Tuesday, I'm trying to find someone to take that shift but if I can't and I end up calling out, will I get in trouble for that? Do availability requests expire, should I submit a new request?