When you select no show or cancel on the schedule, the visit should turn a different color, so at a quick glance you can tell which ones were a no show when looking at the actual schedule or have a RED or BLUE check box instead of the GREEN one that occurs when you check someone in. If you use the all on the status drop down, you still cant see which ones were cancelled or a no show, as they remain the same color. So you are forced to look at the status cancel and no show separately or run a report in excel.
I would also include a same day cancel, last minute cancel. technically the client is not a no show, however often creates a problem with the lack of ability to refill the appointment.