朋友结婚，想请假，写一份英语请假条，怎么写

I have been invited to participate in my best friend's wedding on xxx (日期). So I would like to ask for one day leave(这是请一天假，如果是半天那么是half day leave). It will be highly appreciated if it is granted.

Dear Sir or Madam,
I should ask for a leave for taking part in my friends'wedding today. And I will be back to work tomorrow morning.
Thank you .
Oct 28th,2008
xxxx