急！！用英文回覆

My dear Secretary or Boss
I am heartily grateful to your invitation to the New Year's dinner party. As told, I will be there to be accompaning with three colleagues to attend that parting at 6 p.m. sharp. Thank you again for your kind invitation. I remain.
Yours Sincerely,
_______________
(Name & signature)
Date:
Phone:
Email:

John, Mary & I will attend the annual dinner on 21 Dec, 2011, please count us in~ thank you~