Perhaps you are correct, Mya, maybe most guys are disrespectful. I don't know your clientele. I do know that I'm always on time (or I text/call and let them know). I think I've had 4 cancellations, and all were communicated well before the appointment. Three of them were with the same lady!!! (I'm sorry, Italiana Princess-it really was bad luck! 2 were work related, and the other time I came down with bronchitis!)
However, you may want to consider that many of your clients might have a great deal of difficulty meeting, especially if they have significant others that can mess with their schedules.

sometimes stuff happens!