Nancy is in her final year at university. In order to graduate in November, she must submit her final folio of work to her supervisor by October. Nancy takes her work to Casey to be professionally bound. She explains to Casey the importance of having the work completed by 1 October, and Casey assures her that this can be done. The binding process is delayed due to technical issues and the bound folio is not delivered to Nancy until late October. As a result, she is unable to graduate until February. Her parents then have to cancel their flight from Perth to Melbourne and lose a deposit of $500. Nancy telephones Casey and tells him that he has ruined her life and that he owes her parents $500 for their lost deposit. Advise Casey of his liabilities.