求一篇英语作文《对参加生日聚会邀请的回复》

Dear Henry:
Thank you very much for asking,I'm so glad to be included in the limited number of guests that you've inviated and I'd like very much to join you.However,Most unfortunately, however, we shall be unable to avail ourselves of your kind invitation on account of a previous engagement for the same day. I have asked John to bring by gift there, please accept it as a humble token of our felicitation on the party.
With best wishes for a very jolly home diner.
Yours sincerely,
Jane

Dear Henry,
I am sorry that I can not attend your birthday party.
I am very busy in tht day.First, I have to go to help my cousin review his worksheep for his test in tomorrow .And then i need to help my mother prepare the food for the dinner because she's going out for the business.The
last thing i need to do is return the book to the
library or i will be fined.So i do not really have time.
But anyway,happy birthday.And enjoy yourself.

Best wish
Jane