You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Example Input: Sentence1: Then you are all set? Sentence2: I booked you a black volvo. The driver can be reached at 07410117478. Is there anything else I can help you with today? Sentence3: I'm sorry, I clearly wasn't paying attention. Yes that is all I need. Sentence4: Booking was successful. The table will be reserved for 15 minutes. Reference number is : 0IJIWWQ9 . What else can I help you with? Sentence5: We have five hotels that meet that criteria, are you looking for a specific part of town? Sentence6: Yes. Have a great day. Sentence7: Anything in the centre would be fine, whatever you recommend. Sentence8: Regretfully, I don't have a listing for Venetian cuisine. Do you have a second choice? Sentence9: I'm looking for a place that has 3 stars and free parking. Sentence10: There are over a hundred restaurants to chose from do you have a price range? Sentence11: Does that one have free internet as well? If so it will work great for me. Sentence12: Yes I can. What type of place to stay would you like? What area of town? Sentence13: Yes the hamilton lodge is 3 stars moderately priced and offers free wifi and parking. Sentence14: There are 4 results. restaurant one seven, the oak bistro, the copper kettle, and cotto. Would you like more information on any of those? Sentence15: Sadly, I don't have access to that information. The Oak Bistro might be a good choice. Their phone number is 01223323361 if you'd like to call them Sentence16: Thanks, I need a taxi to commute between the two places. Sentence17: I am not looking for a specific area, but I would like for it to be in the moderate price range, please. Sentence18: Definitely something moderately priced. If you can't find Venetian, how about British? Sentence19: Thank you for calling. Sentence20: I'm looking for a restaurant that serves venetian food. Sentence21: Yes, please. Find out which of the four restaurants have vegan options, please? Sentence22: How about the hamilton lodge it's located in the north. Sentence23: I am traveling between the two places discussed, I need to reach the restaurant by the booked time. Sentence24: I can help you book a taxi but first I need some information - where are you leaving from and what's the destination. Also what time do you want to leave? Sentence25: I also need a place to stay. Can you help with that? Sentence26: Okay, well, let's go ahead and book a table for one at 11:30 on Tuesday. Question: Who has spoken the sentence 18? (A) User (B) System
Example Output: Answer: (A) User

Example Input: Sentence1: How many tickets please Sentence2: I want to go to Cambridge on Wednesday. Sentence3: I can give you all kinds of information as well as book a ticket. Where are you going and when? Sentence4: Have a great stay in town. Goodbye. Sentence5: Train TR9741 arrives at 07:52 and I have booked you for 2,here is your information:Booking was successful, the total fee is 8.8 GBP payable at the station . Reference number is : U44P6DQP . Sentence6: I want you to book it for 5 nights, starting wednesday. 2 people. Sentence7: Where will you leave from? Sentence8: Sure thing, what kind of information do you need? Sentence9: Nope, that's all I need today. Thanks for all your help. Goodbye! Sentence10: Okay that booking was successful. Your reference number is 2VD26230 . Anything else I can do for you? Sentence11: I am looking for information and would appreciate the help. Can you help with a train? Sentence12: Would you like to specify a departure or arrival time? Sentence13: I would need 2 tickets. Sentence14: Can you also look up the hotel Carolina Bed and breakfast? Sentence15: I will be leaving from ely. Sentence16: I need to arrive by 08:45 Question: Who has spoken the sentence 13? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: I am planning a trip in Cambridge Sentence2: hobsons house meets your needs. Would you like to make a reservation? Sentence3: Do you have an area you prefer? Sentence4: your booking was successful. Reference number is : 32C66ISH . Sentence5: Great - how can I help you? Sentence6: I am looking for a moderately price place to stay while i'm there. Sentence7: I would like to be in the west. Sentence8: Sounds good. I need a booking for 5 people, 5 nights, starting wednesday. Question: Who has spoken the sentence 3? (A) User (B) System
Example Output:
Answer: (B) System