I have had them call me for a international show time and been puzzled/nervous... Phone rings and
"Hey you have a show time of ...."
Aren't I on the Sick List? (and you're thinking aren't I on sick list???) hmmm
"Oh NO! OOPS we need to get someone on that trip. Sorry to bother you."
Makes you nervous at first because we are always guilt till proven innocent.
I have had the trip stay in calender for sometime afterward, but as long as you have the ref number you should be good to go. Cover you A$$...
H