Howdy, Sigrid!
Champion, the only thing you have to do is modify the owner ID field of the record being booked. Practically,
you should only use the update() method of your Data class to do so. You are not required to create new records. Instead, you should only use the records that exist in the .db file that is provided to you when the application starts, and who creates them doesn't really matter. The thing is, let's say that the owner ID field of record 1 is empty, and a client wants to book this room. Your application has to provide a way for the user to provide a customer ID (you may verify this, but in the instructions I received, it says that it is an 8 digit number known by the CSRs, so you may assume that any 8 digit number is valid) and update the record properly. That's just it! You are not required to provide a way to create or delete records.
Cheers, Roberto Perillo
SCJP, SCWCD, SCJD, SCBCD