题目：Letter of Thank-You and Apology感谢与道歉函
Dear Mr.Smith:
Thank you very much for giving so much help to our Sales Manager Adam Francis while he was in San Francisco.
Mr.Francis must have already written to you to express his gratitude,but I would like to thank you on behalf o the whole company.The information you provided and the contacts you helped him to establish are most useful to our efforts in the Bay area.We wish to have more help from you in the future.
If I can offer you any similar service,please feel free to contact me.
Yours Sincerely
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