Find the specific appointment before anything else, since the policy, the available alternatives and the identity check all depend on which one it is.
Lookup that works for real customers
Allow identification by phone number, email, name and date, or by a link from a reminder message, since customers rarely have a booking reference to hand.
The reminder link is the strongest route, because it identifies the appointment unambiguously and requires the customer to do nothing.
Handling multiple appointments
Customers with several upcoming appointments must select which one, and presenting them clearly with date, time and service prevents the wrong one being moved.
This is a common source of errors when rescheduling is handled by phone, and it is entirely avoidable in a written flow.
Verifying entitlement to change it
Confirm the person is the customer or is authorised to act for them, since appointments can be changed maliciously and the consequence falls on someone else.
Matching against the contact details on the booking is usually proportionate, with stronger verification where appointments are sensitive.









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