!3 ''Change the length of a booking for the future''
|''begin transaction for client''| Joanna |''staff''| Bill|
|''book''|2||coffee dispenser|''on''|2004/05/08 09:01|''for''|2 hours|
|''pay with cash $''|6.00|
|''complete transaction''|

!3 ''One day later...''
|''time is now''| 2004/05/07 09:01|

|''begin transaction for client''| Joanna |''staff''| Bill|
|''change period of''|2||coffee dispenser|''for''|2004/05/08 09:01|''with duration of''|2 hours|''to''|5 hours|
|''pay with cash $''|9.00|
|''complete transaction''|

 * ''Checks''
|''client booking list''|Joanna|
|''rental item''|''count''|''start date''|''end date''|
|coffee dispenser|2|2004/05/08 09:01|2004/05/08 14:01|

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