If you want to bring back a cancelled booking, or un-cancel it,
you can do the following:
1) Click on 'cancellation' on the menu at the top of the screen
2) click on 'Cancelled Bookings'
3) Look down the list and Find the booking that you want to bring back.
4) click on the booking you want to bring back
5) check that it is the correct booking
6) Click on 'Bring back booking' in the top left corner.
Your booking should now be restored.