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: Happy to be of service. Have a wonderful day! Sentence2: Ok. I was able to book for 4 nights. Your reference is DTUFTTJP . Can I help with anything else? Sentence3: Yes, for 5 nights beginning Wednesday for 1 guest please. Sentence4: I am also looking for information about a restaurant called Zizzi Cambridge. Sentence5: Can you please repeat the phone number and provide the address. Thank you. Sentence6: The Autumn House is located at 710 Newmarket Road. Would you like for me to book this for you? Sentence7: I was unable to book, could you please choose another day or pick a shorter stay. Sentence8: Hello, I am looking for a certain hotel in Cambridge called the autumn house. Sentence9: No, I think that's all I need right now. Thanks very much for your help! Sentence10: How about 4 nights instead of 5? Sentence11: Zizzi Cambridge serves Italian food and is cheap. The phone number is 01223365599, or should I book a table for you? Sentence12: The phone number is 01223365599 and zizzi cambridge is located at 47-53 Regent Street postcode cb21ab. Can I help you with anything else? Question: Who has spoken the sentence 4? (A) User (B) System
A:
Answer: (A) User