篇一：

　　dear sir/madam:

　　we would like to invite you to an exclusive presentation of our new [product]. the presentation will take place at [location], at [time] on [date]. there will also be a reception at [time]. we hope you and your colleagues will be able to attend.

　　[company] is a leading producer of high-quality . as you well know, recent technological advances have made increasingly affordable to the public. our new models offer superb quality and sophistication with economy, and their new features give them distinct advantages over similar products from other manufacturers.

　　we look forward to seeing you on [date]. just call our office at [phone number] and we will be glad to secure a place for you.

　　sincerely yours,

　　[name]

　　篇二：

　　dear sir/madam:

　　i’m delighted you have accepted our invitation to speak at the conference in [city] on [date].

　　as we agreed, you’ll be speaking on the topic "xx" from [time] to [time]. there will be an additional minutes for questions.

　　would you please tell me what kind of audio-visual equipment you’ll need. if you could let me know your specific requirements by [date], i’ll have plenty of time to make sure that the hotel provides you with what you need.

　　thank you again for agreeing to speak. i look forward to hearing from you.

　　sincerely yours,

　　[name]

　　[title]