I think it's in troubleshooting but,
Make an event of a waitress, so you know she's there.
After you talk,write a message eg.
WAITRESS,Come here.
Select Move Event and move the waitress.
hint:Give thewaitress event a name so it would be easear to move it instead of finding it.This is what i understood, but if you didn't get your problem,
I know someone who is 99% going to post here.