Detailed Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Certainly. The address is Regent Street City Centre. Do you need anything else today? Sentence2: How about Charlie Chan in the centre right by Regent Street City Centre? Sentence3: May I have their address please? Sentence4: I'm looking for a cheap Chinese restaurant. Sentence5: Downing College is located in the city centre, the phone number is 01223334860, admission is free, the postal code is cb21dq. Sentence6: It is cheap. Would you like me to book that? Sentence7: No need to book anything. But can you give me their address please? Sentence8: Thanks. Is there a college nearby? Sentence9: Downing College is also located on Regent Street, would you like their information? Sentence10: Okay, thank you for your help. That's all. Sentence11: Enjoy your day, and thank you! Sentence12: If that is cheap, it sounds perfect to me. Question: Who has spoken the sentence 1? (A) User (B) System
A:
Answer: (B) System