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]