Dear sir/madam:

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 pany is having a reception at [hotel] on the evening of [date] and I would be very pleased if you could attend。

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I look forward to hearing from you soon。

Yours sincerely，

[name]