Use the waitlist to fill cancelled times

1. Open Tasks and choose Add to waitlist.
2. Enter the name and phone, the branch and what it is for. Tick Urgent to put them first.
3. When any appointment in that branch is cancelled, the front desk gets an alert with who is waiting.
4. The first waiting patient with an email also gets the free time and a booking link that opens on that day.

Nothing is held: whoever books first gets the time. Mark people Booked in Tasks when they take one, or offer the slot on WhatsApp with one tap.