Because they feel that they are so special that you can some how... some damn way fit them in. I had that problem at the grooming salon... People used to scream at me over the phone when I was booked. I can't help it that other people called before you... TRY NEXT WEEK!
because they are more important than everyone else. you dont need a lunch break and you dont need to finish on time but they need to be seen..i deal with it all the time