Sincerely I would like to join in your wedding ceremony on 28 february.Unfortunately the company has to have very important appointment.I'm very apologize I have go to other country for big conference of my company on that day.So that's why I need for deny.I'm feel terribly I can't join ceremony of my best friend.I will be back on 1st of march .I'll call you in that day.We'll have dinner together.