|''begin transaction for client''| Joanna |''staff''| Bill|
|'''reject'''|''book''|200||coffee dispenser|''on''|2004/05/08 09:01|''for''|2 hours|
|''complete transaction''|
 * ''Checks''
|''client booking list''|Joanna|
|''rental item''|''count''|''start date''|''end date''|

|''rental item subset''|
|''name''|''free count''|
|coffee dispenser|10|