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Dear sirmadam:

　　[organization] would very much like to have someone from your pany speak at our conference on [topic]。

　　As you may be aware， the mission of our association is to promote 。 Many of our members are interested in the achievements your pany has made in 。

　　Enclosed is our preliminary schedule for the conference which will be reviewed in weeks。 I'll call you [date] to see who from your pany would be willing to speak to us。 I can assure you that we'll make everything convenient to the speaker。

　　Sincerely yours，

　　[name]

　　[title]