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 will book you and get back to you, you are welcome Sentence2: We have 14 places matching your criteria. Lets narrow this down. Is there an area you prefer? Sentence3: King's Parade, cb21rh. Is there anything else you need to know? Sentence4: Perfect. That's all I need help with. Have a great day. Sentence5: You, too. Please call if you need anything else. Thank you for calling. Goodbye. Sentence6: Just the 4 of us Sentence7: There are quite a few for you to choose from. Did you have a particular area of town you would prefer to spend your time in? Sentence8: What time will you be traveling? Sentence9: Can I please get the reference number? Sentence10: No, I'm really not picky. j Sentence11: I'm traveling to Cambridge and looking for places to go. Are there any good colleges to see? Sentence12: Yes i need to book a taxi to leave the hotel by 22:00 and go to the attraction please. Sentence13: I would like to leave my hotel by 22:00. Would you mind getting the college address for me? Sentence14: The reference number is T8N3WK5T . Is there anything else I can help you with today? Sentence15: Yes, I would like to book it for 4 people for 5 nights starting from Tuesday. Sentence16: I'd be happy to help with that. May I ask if there is a price range or area you prefer? Sentence17: No, I just need help finding a place to stay. Sentence18: For how many people? Sentence19: Thank you, Yes, I will need a taxi from the Acorn Guest House to corpus christi college. I also did not get the college address. Sentence20: How about the Acorn Guest House? It is in the north area and has 4 stars with free internet and parking. Would you like for me to book it for you? Sentence21: The college address is king's parade cb21rh. The entrance fee is 2 pounds. Is there anything else I can get for you? Sentence22: No, any area will do. Can you recommend one? Sentence23: Your taxi has been booked. It will be a red Ford and the contact number is 07500369982. Sentence24: I sure can. How about corpus christi in town centre? Sentence25: Yes that sounds great. Can you give me the address for that college? Sentence26: I need a guesthouse in the moderate price range that includes free parking. Question: Who has spoken the sentence 20? (A) User (B) System
Output:
Answer: (A) User