You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: I want to leave the restaurant by 17:00 please. Sentence2: I have 15 in the centre. Did you have a food type preference? Sentence3: What time would you like the Taxi? Sentence4: Their phone number is 01223334860, they are located at regent street, and their postcode is cb21dq. Sentence5: Your booking is complete. It will be a white honda and its contact number is 07316123574. Sentence6: Thank you! Hope you have a wonderful trip! Sentence7: Rice House sounds interesting, and I need some cheap egg rolls. What postcode is that place in? Sentence8: Can I get their phone number, address and postcode please? Sentence9: There are not. The only multiple sports center is located in the east. Would you like more info on it? Sentence10: I'd like a taxi to commute back and forth please. Sentence11: Sure. We have 13 colleges in the city centre. While many are free, some do have an entrance fee. Sentence12: The post code is cb12bd. They have amazing egg rolls! Sentence13: Thanks - I am also wondering if there are any multiple sports attractions in the city centre. Sentence14: There are three Chinese restaurants. They are charlie chan, rice house, and golden house. Does one appeal to you? Sentence15: How about a college type attraction in the same area as the restaurant then? Sentence16: Could you find me a cheap restaurant in the centre please Sentence17: I would say Downing college is the best. What info shall I provide you with concerning that place? Sentence18: Would you recommend one? Sentence19: Is there one that serves chinese food? Sentence20: Thanks a bunch. Have a great night. Take care. Bye. Question: Who has spoken the sentence 4? (A) User (B) System
Output:
Answer: (A) User