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A: What can I do for you? 
B: I need to return something. 
A: What do you need to return? 
B: I need to return this cellphone that I just bought. 
A: What is wrong with it? 
B: It isn't working properly. 
A: What is the problem with it? 
B: For some reason the phone cuts off by itself. 
A: I see, and do you have your receipt? 
B: Here you go. 
A: I'll take care of this right now. 
B: I appreciate your help.