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,
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