学海无涯常见英文商务邀请函写作范例 Dear sir/madam:Im delighted you have accepted our invitation to speak at the Conference in on .As we agreed, youll 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 youll need. If you could let me know your specific requirements by , Ill 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,