If they haven't signed a contract or made a decision or put any money down I agree with " Sorry I am all booked up for that week .,
And taking all your books to a sit down appointment I would be charging by the hour and it wouldnt be cheap . I would tell them upfront .
I dont sell cakes but I have learned so much from this site :)
I also must say if you work from home or have your own little business it seems people think you are running a cake charity . After all its " just cake" @@ ( eye roll ) as some of you have said. But most of you here put your heart and soul into decorating and its not Just Cake it's incredible works of ART .