currentdate: 0
12009312: Invalid patron id-should be 6digits. Registration cancelled
A120.2.1	Knight	Artificial Intelligence
S120.2.1	Rodney	Sunny Days
123412: patron-id already exists. Registration cancelled
L120.2.1: call # does not exist. Checkout cancelled
No books overdue
currentdate: 5
Out: L141.2.1, Rubini, Linux Device Drivers. Due date: 7
patron id- 123412: no books checked out.
currentdate: 7
W12.3 v1	Call number doesnt exist
No books overdue
currentdate: 8
L141.2.1 ,Linux Device Drivers. Patron: 500000, David
500000, David. patron-id has books overdue. Checkout cancelled.
call # L141.2.1 not available.
500000, David 121 Houston St, Blacksburg, VA-24060. days overdue: 1