You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: ok. can you find me a nice hotel where i can spend over the weekend Sentence2: i booked that for you. your reference number is 2tn0v6dq . Sentence3: The postcode is cb23qf. Is there anything else I can help you with today? Sentence4: Yes, I am interested in one located in the city Centre. Can you list out several for me so I can choose from them? Sentence5: So sorry, I was distracted. I need to arrive at the restaurant in time for my booking, please. Sentence6: I'd like it for 7 people please. And could you also get me a taxi to go between the two? Sentence7: Can you give me the post code for the Soul Tree Nightclub? Sentence8: I can book that for you now. Sentence9: Booking completed! Your car is a blue honda and the contact number is 07559573662. Sentence10: yes can you please help me with that? Sentence11: Thank you so much. That's all I need for today. Sentence12: Thank you. Can you also book me a taxi to go between the two? Sentence13: There are five nightclubs in the Centre. May I suggest Soul Tree Nightclub? It cost four pounds for the entrance fee. Sentence14: You are welcome. It has been a pleasure assisting you today. Have a great day. Sentence15: Ok, and for how many people? Sentence16: I would also like to book a table for a restaurant that serves British food and is expensive. I need this to be in the same area as the nightclub. Sentence17: There are 44 different attractions in the centre ranging from architecture to nightclubs. What type of entertainment are you interested in? Sentence18: Please give me a list of nightclubs and the admission fee Sentence19: I'm sorry, I don't have a listing for an attraction by that name. Sentence20: Yes when would you like to book? Sentence21: Perhaps you were interested in an attraction located in city CENTRE? Theatre? dancing? dining? museums? If not, I can help with hotel booking too. Sentence22: Unfortunately, I don't understand your message. To book your taxi, I need to know where you are starting and going to. I also need to know what time. Sentence23: I wanted to visit a place called Center, could you tell me the hours it's open, and if it is an attraction that I would need to book in advance? Sentence24: I found 3 restaurants matching your request. The cambridge chop house is very popular. Would you like to book a table there? Sentence25: Sure. I'll just need to know where you want to be picked up and where you want to be dropped off, plus either when you want to leave or arrive by Sentence26: please do and give me car type and contact Sentence27: I'd like to book a table for 12:00 on Wednesday Sentence28: adress and phone number please and thank you Question: Who has spoken the sentence 4? (A) User (B) System
A:
Answer: (A) User