If you cancel a Globe exchange, it depends on whether you gave the Globe or if you received it. If you gave the Globe to the other member and it has already gone, it will not be returned upon cancellation. If you received the Globe and you cancel, it will be returned. If it is already committed to another exchange then a different Globe will be returned. If you don't have a different one to return, a new one will be generated for the other member but you will owe the system a Globe which will be returned when you next get one.