Add a drop down on the Settings Tab under General to allow for the system to auto-cancel for 1, 2, or 3 hours prior to an appointment if the prospect ?

Add a drop down on the Settings Tab under General to allow for the system to auto-cancel for 1, 2, or 3 hours prior to an appointment if the prospect is not responding. A 1 hour notice to cancel means we are already driving to the appointment by the time we hear about the cancellation.