When a patient to an office cancels their appointment ("cancel" is also a trigger to unsubscribe), that patient is then unsubscribed to all messages from that office. It seems odd to cut off all communication with an office if the patient just simply cannot make that appointment. The patient would then have to call in and reschedule and the office will inevitably call Weave to get that patient back for sms communication. We've created our own call volume on this.