表示感谢的英语两人对话,至少8轮

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L:Hello!How may I help you?S:Hi!I’m trying to find a few books,but I’m lost.L:OK.What books do you need to find?S:I need to find three English conversation books by Professor Brown.L:All right.Those books are at the main desk on the third floor.S:How do I get there?L:Just take this elevator up two floors.The desk is right outside.S:Great.Thank you very much!L:You’re welcome.Good luck!