Will Updating Appointment Availability Affect Existing Bookings?

What Changes When You Update Availability

Change	Affects existing bookings?
Remove a time slot from availability	❌ No — existing bookings in that slot remain
Add new availability	❌ No — just allows new bookings in the new window
Change booking window	❌ No — only affects future booking attempts
Block out dates	❌ No — existing bookings in blocked dates remain
Change instructor assignment	❌ No — existing bookings keep the original instructor
Cancel the appointment type	❌ No (existing bookings remain until manually canceled)

The rule: Availability changes only affect new bookings. Existing appointments are never automatically canceled or moved.

What You Need to Do Manually

To change or cancel an existing booking after updating availability: go to Schedule > Calendar, find the appointment, then Cancel or Reschedule it. The customer receives a notification.

Before removing availability or blocking dates, check the calendar for existing bookings and contact affected customers to reschedule.

Exception: Block Out Dates with Warnings

When you block a date range that has existing bookings, Zipper warns you about the conflict. You then decide whether to cancel those bookings (manual action required) or leave them as-is.

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Need a hand?

Email our team at support@joinzipper.com and we'll usually reply within a few hours.

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