Dear sir/madam:

　　I’m delighted you have accepted our invitation to speak at the Conference in  on .

　　As we agreed, you’ll be speaking on the topic  from  to . 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 , 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,