Here is a sample of informal invitation to dinner
October 28, 2013
Dear Ali,
It is with great pleasure that I write to invite you to the dinner on Tuesday 28 of October, will you have dinner with my family and I at eight o clock?
I haven’t seen you since last spring. its been a long time. I miss you. I heard that you were in need of money few days earlier due to your mother operation. I hope I would help you to get in touch with your kindness of your motherhood soon as possible, and we do hope you will find it possible to be with us.
Yours sincerely,
Behnam Zakeri