How do you write a proper sick note for school for my child?

Date when you wrote note- here---------------------------------------------> ( )

Dear Bunny Hill Elementary school staff,

Please excuse my son, Ben Floppy for his absence from school yesterday ( 1-3-2004). he was ill and unable to attend classes.

Thank You,

Mrs. S. Floppy telephone # ( 222-777-8888 )

Short and sweet not too much detail!