Exciting day yesterday, can't think of any other way to describe it. My diary is full therefore rather than waste people time immediately we answer the phone we tell them I have a full diary and can't take on any more student. The caller said, "don't want any lessons just want to hire your car for an hour for my test." About midday I received a text requesting a lesson for the son at 3.15. Sent back the usual reply, full diary, bla bla bla. Got a reply saying to pick up his son with an address and time for the following day. Didn't reply because I couldn't think of any other way to say I can't take on any more student. 7.20pm I received an email with an address informing me that this young man would start his lessons at 9.30pm Emailed to say not possible and why and he said tomorrow will do then. How do I say I have a full diary and are not able to take on any new students in the near future?