Angie,
When you set appointments, do you allow a window around the appointment time?
I moved back in March and needed to have many different services over the first few months. Each time I scheduled for someone to come out, I was given a 2 hour window. A few times the person was there right at the front of the window and a few times at the end. Often when they came at the front of the window it was due to a cancellation of the previous customer.
Audrey
http://www.scrapping-made-simple.com