关于邀请别人过自己的生日聚会但对方有事不能来但表示感谢的英语作文100字左右

Apology for being unable to accept the invitation
Dear XX,
I'm so sorry I can't come to your birthday party.These days I'm very busy and have to deal with it, so I'll not be able to attend your birthday party.
Thank you for your invitation to join your birthday party , XX. I certainly hate to miss any of your parties. They're always such fun!
Affectionately
XX

朋友邀请我参加他的生日聚会写信告诉他我不能去感谢对方的邀请并表示遗憾用英语怎么说？

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I'm so sorry I can't come to your birthday party.These days I'm very busy and ...

Dear XX,
I'm so sorry I can't come to your birthday party.These days I'm very busy and have to deal with it, so I'll not be able to attend your birthday party.
Thank you for your invitation ...