Click on the appointment which you would like to cancel. A window will open on the right hand side as below. Click on the ellipsis and select "Cancel booking" from the drop down menu:

A pop-up will appear, click on the arrow as circled below:

A drop down menu will appear:

Once you've selected your "Cancellation reason",  click confirm as circled below:

The appointment will disappear from your calendar:

If you would like to view all the bookings that have been cancelled together with their cancellation reason click "Analytics" and scroll down to reports and the "Booking report" as below:

Once you click "Generate report" then you will see the "Cancellation reason" column in your report as circled below:

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