(1) 邀请对方在会上发言

　　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 "" 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]

　　(2) 邀请对方出席会议

　　Dear sir/madam:

　　Thank you for your letter of [date]. I‘m glad that you are also going to [place] next month. It would be a great pleasure to meet you at the [exhibition/trade fair].

　　Our company is having a reception at [hotel] on the evening of [date] and I would be very pleased if you could attend.

　　I look forward to hearing from you soon.

　　Yours sincerely,

　　[name]

　　[title]