Email:Write an email to your cousin living in abroad(USA/UK) thanking for wishing Happy Birthday.

Dear X,

You know that I celebrated my  15th birthday on last week.I arranged a party on that occasion.All my relatives and friends attended the party. But unfortunately you could not attend the party because you have been living in USA.But you wished me Happy Birthday throw social media.Thank you very much for wishing me Happy Birthday.But I would be glad to you if you could join with us

Yours ever

Y