请帮忙写一篇Invitation

请帮忙写一篇Invitation
Direction:Write a formal Invitation according to the following information.Suppose your boss,Mr.John Smith,would like to invite Mr.and Mrs.Lilly Bush,his clients,to a costume dance held at Holiday Inn at 8:30 p.m.on Friday,the 3rd September.He ask you to write a letter of invitation for him.