|''begin transaction for client''| Bob |''staff''| Bill | |''rent''|1||Truck|''for''|1 day| * Actions |''begin transaction for client''| Joanna |''staff''| Bill | |'''reject'''|''book''|1||Truck|''on''|2004/05/06 11:01|''for''|2 days| |''complete transaction''| |''resume transaction for client''| Bob| |''pay with cash $''|2000.00| |''complete transaction''| * Checks |''rentals of client''|Bob| |''rental item''|''count''|''start date''|''end date''| |Truck|1|2004/05/06 09:01|2004/05/07 09:01| |''rental item subset''| |''name''|''free count''| |Truck|0|