How to make an apology letter to the college dean for not attending the seminar?

i dont know how to write a formal letter of apology, i need it badly because my prof asked me to write an apology letter for i didnt attend a seminar in our school for the reason that i accompanied my mom for her general check up. pls.. help me i need it badly! i need some response now.. pls.. write an apology... show more i dont know how to write a formal letter of apology, i need it badly because my prof asked me to write an apology letter for i didnt attend a seminar in our school for the reason that i accompanied my mom for her general check up. pls.. help me i need it badly! i need some response now.. pls.. write an apology letter for me.
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