Given the task definition and input, reply with output. You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: No, any price range is fine. I would just like to know the address and price range of one of the restaurants. Sentence2: Is there a chinese restaurant in the south part of town? Sentence3: I need a South restaurant with british food. Sentence4: I'm sorry but I cannot find any british food located in the south part of town. Sentence5: No, thank you. Sentence6: Thank you. Sentence7: I've found three Chinese restaurants in the south part of town. Does price range matter to you? Sentence8: Peking Restaurant is an expensive Chinese restaurant that is located at 10 Homerton Street City Centre. Is there anything else I can help you with today? Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User