Once a 1-to-1 meeting is booked, it's possible to amend the meeting. Whether this is to edit it such as changing the date of it, or you need to cancel the meeting.
Tap Menu.
Tap 1-to-1.
Tap on the 1-to-1 meeting that you want to amend.
Tap the three dots in the top right.
You can then either:
Edit the meeting - This allows you to return to the options you had when booking the meeting in the first place, such as date and time
Cancel the meeting - If the meeting can no longer take place, you can cancel it. This moves the meeting to the Completed tab
Delete the meeting - If you want no record at all of the meeting, you can delete it