business english--請假遲返

Purpose of this note: Excused from school for two hours tomorrow
I was schelduled for an interview tomorrow and since I was unable to reach you by phone, I am sincerely asking for permission to be excused from school for two hours. Thank you for your time.

As I am unable to contact you by phone this morning / this afternoon, I am writing to you to excuse me from school for two hours tomorrow thus enabling me to attend an interview that day. Please grant me your permission after taking this special case into consideration .

I had called a while ago but you were busy.
I would like to have your kind permission to allow me 2 hours late for the interview which scheduled at 2:00 PM.

Since I have to attend an interview tomorrow and could not reach you by phone, I am writing to ask for your acceptance of my request to work 2 hours later than the normal time. Thanks for your consideration.