Can anyone help me to make me a new letter format =)

Hello everyone, nice to meet you all:-D.
The purpose I writhing here is to kindly request help form you all:roll:.
My sir had ask us for creating a new letter format other than the old one for all members.
The old format like this:

Your address

School address----------------------------------------------- Date

Dear Sir,

Re: Reason for late/not Performing Duty/did not Attend The Activity

With reference to the statement above, to be inform that I (your name), (your class), did not perform my duty which was held on (date & time).

2. (Your reason)

3. I would like to apologize for not performing my duty. I hope that dear sir/madam can forgive me for my inconveniences.

Thank you.

Yours truthfully, --------------------------------------Approved by,
(Your signature)------------------------------------- (one who may
------------------------------------------------------proof that your
------------------------------------------------------reason are true-
----------------------------------------------must be teacher or parent)



This is the old format we are using. My sir wants a brand new one, and make sure can be used commonly and the grammer are correct. The green one is the most need to be changed.
Your reply are kindly appreciated. :-D Thank you.;-)