Double booking project ideas please

[Ion]

Hia
i've got to design a database system that prevent the user from double booking and i'm truely stuck for ideas. i was wondering if anyone here has been presented a project that was similar so i can get some ideas for my coursework or knows of anyone who requires this type of work doing.

thanks for any help.

[php~pro]

A simple check for a name and booking date with the database would do this. If a result is returned send the user a message instead of running the script.