Dear Professor :
We are very glad to hear that you will attend an international conference in Beijing. We are writing to inquire about the possibility of inviting you to give a lecture on American literature to our graduate students on the evening of June 16.
It has long been noted that you have done a great deal of substantive and creative work in this area. Over the years, two of your books have been textbooks for our students. Therefore, all of us believe that your lectures will benefit our students and faculty.
If you can come, please tell us your flight number and we'll meet you at the airport. If you can. If we can't arrive on time, please let us know.
We are looking forward to your coming.
Sincerely yours,