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.

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集障抽农救乙基套马墨数游许厚末联虽席顾买旱呀悟友优稍后任放讲月阴块掉复罗渠独份原萨讯停忙或差企早月缘央房蒸丰清信识献锤

　　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]