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Assistant: Good morning. Can I help you? 
Helen: Yes. I'd like an umbrella, please. 
Assistant: Look at the red one. Is it nice? Helen:Yes, it is. How much is it? 
Assistant: It's fifty yuan. 
Helen: It's expensive. 
Assistant: What about the white one? It's twenty yuan. 
Helen: It's nice and cheap. I'll take it. Here you are. 
Assistant: Thank you. Here's your umbrella. Helen:Thank you.