If a customer has had to cancel or wants to rearrange, and your policy does not state giving refunds, you can provide guests with a voucher for the amount they have to be able to book again in the future using the money they had previously paid.
Firstly you'll need to create a monetary voucher with 'Flexible amounts' enabled.
Make sure when you're creating a 'Flexible Amount' voucher that you're entering an default Amount for the voucher (this can be changed by the user at check out). We would also recommend setting this up to be used
How to issue a custom voucher amount?
To put through a voucher in Trybe to send to your customer - follow the steps in this guide
If selecting a Voucher type that is set up for Flexible Amount you'll see 'Voucher Amount', field that you can edit. It will always show the defaulted amount set up on the Vouchers settings, but this can be overridden by any user.
Once you've entered the credit amount > Add Item and send out to your Customer as per your usual Voucher sale process, by selecting the three dots > send (orders must be checked out in order to send vouchers)...
The customer will receive an email with the Voucher code to then spend on the shop front to book in their new appointment.