Agree with rothchild42.
And I can't blame em as I'm sure they get plenty of no-shows after an appointment is made.
Best to just call with in 5-10 minutes of arrival and ask if "_____" is working and is she available.
This also tells mammasan your not a newbie.
Alternaely, just walk in.
I like to go early, shortly after opening, when everything is fresh ;-) or 2-4pm range, avoid the "lunch hour" mongers