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.
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.
thank you for your letter of [date]. i’m glad that you are also going to [place] next month. it would be a great pleasure to meet you at the [exhibition/trade fair].
our company is having a reception at [hotel] on the evening of [date] and i would be very pleased if you could attend.
i look forward to hearing from you soon.
dear sir or madam:
we are very pleased to invite mr. ****** come to our company for visiting and business negotiation. the business trip will start from 30th oct.***. and because the long business co-operation in future between ****** company. and us， they will come to china for many times. please note， however， that we don’t assume any legal or financial responsibility whatever regarding the presence of ****** in china. all expenses of ******’sjourney to/from china， their stay in china as well as health insurance will be borne by their employers. we send you our kindest regards and best wishes for a pleasant trip.