接受别人生日聚会邀请的英语作文

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