【正确答案】Dear Sir,
My name is Li Ming. We met last Tuesday afternoon. It is very kind of you to offer me a job interview this Thursday afternoon (December 20). But I am very sorry to write to you and tell you that I can't meet the appointment. My supervisor has rescheduled his lecture to Thursday afternoon, so I won't be able to excuse myself then.
I'll be very grateful if you could kindly schedule my job interview to anytime Friday afternoon. You see, I've been looking forward to the interview.
Please spare a little time of yours to send me a message or give me a call and inform me of your decision.
Sincerely yours,
Li Ming