In a slightly more advanced way, you want to place an order that says "Transfer 50 to B at 5:00 PM on September 23, 2021." In this case, other than the data storage where the transaction details are stored, the system would also need a separate data store for recording such reservations. In the banking system, this can be configured to a program with the function of
transfer to B at 2021.09.23. at PM 5:00.(time) so that it can be processed automatically. If a human does it, it has to be memorized and executed when the time comes, but it is
automated by putting a program called reservation transfer.