道歉信和感谢信.内容是某人请你吃饭你没去表示歉意.和某人请你吃饭你欣然前往,就行了.急用 高赏~

Dear XXX,(道歉并感谢)
Thank you for inviting me to your house for a dinner。I'm really appricate for that and would like to go。But I have a date on that day。So I'm sorry that I can join you。Thanks again for your hospitable inviting。
Best regards!
Yours Sincerely,
XXXXX
Dear XXXX,（感谢信——表示可以参加）
I have received your invitation letter。Thank you for inviting me to have the dinner in your house。I'm glad that you have still thought of me for a long time。And don't worry and I'll go there in time。
Thanks so much again。
Best wishes。
Yours Sincerely
XXXXX