Dear Mr.Green,

　　I’m writing on behalf of Mr.John Smith.He’d be delighted to be your guest for lunch at the Royal Restaurant,March 16.It will be a good opportunity for him to talk in more detail about the new project and at the same time have an enjoyable time together.? As you suggested,he’ll be arriving at the restaurant at 11?∶40.

　　He’ll be looking forward to seeing you then.