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

[EX Q]: Sentence1: The TR1156 leaves at 15:16. Will that work for you? Sentence2: There are 13 colleges in the centre of town. Would you prefer a college without an entrance fee? Sentence3: Yes can I have an arrival time please? Sentence4: I need a train on Saturday after 14:30. Sentence5: I need to travel to Norwich from Cambridge after 14:30. Sentence6: Okay thank you for your help. Sentence7: I'm looking for a place to in the centre, perhaps a college. Sentence8: No preference. Can you make a recommendation and give me the address, phone number, and entrance fee? Sentence9: The arrival time is 16:35. Sentence10: Thank you for using Cambridge TownInfo Centre. Sentence11: Where are you leaving from and traveling to? Sentence12: christ's college is great. the address is st andrews st, free entrance & their number is 01223334900, anything else? Question: Who has spoken the sentence 1? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: What area would you like to stay in? Sentence2: I need it for 7 people. 5 nights starting Sunday. Sentence3: Which of the 2 hotels should I book for you? Sentence4: Are there any amenities that you are looking for? Parking? Internet? Sentence5: TR2021 is leaving at 20:24 would that work for you? Sentence6: I don't really have a preference for area. But I would like it to be a hotel rather than a guesthouse. And I would love free parking. Sentence7: I'd like free parking. Sentence8: How about the Ashley Hotel? Sentence9: Booking was successful, the total fee is 56.56 GBP payable at the station . Reference number is : EZIAXWCQ . Can I help you with anything else? Sentence10: Great! I'm glad I could be of help. Have a good day. Sentence11: We have ashley hotel and lovell lodge, shall I book you for one of the two? Sentence12: I am also looking for a train departing from stansted airport going to cambridge on sunday. I need to leave after 19:30. Sentence13: I'm looking for a place to stay in Cambridge, moderate price for a hotel. Sentence14: Yes, please make a booking for my group. We'll all be traveling together. Sentence15: Thank you that is all I needed today. Sentence16: Booking was successful. Reference number is L1S8JNAC . Do you need anything else? Question: Who has spoken the sentence 4? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: Yes it has free parking and internet. Sentence2: Yes please. The north side of town and only 4 star guesthouses please. Sentence3: Actually, I'll hold off on booking for the moment, but could I also get information about a taxi. Sentence4: I would like to leave the museum by 16:00, please. Sentence5: I found 24 guest houses for you. Any particular area you have in mind? Sentence6: The address is castle street and the phone number is 01223748100. Sentence7: That one sounds great. Can you give the address and hours? Sentence8: Sure, how many days will you be staying and how many people in the room? Sentence9: Ok to be clear what is your destination and your departure locations? Sentence10: There are 8 guesthouses on the north side of town. May I suggest Acorn Guest House or Arbury Lodge Guesthouse? Both are moderate price range with 4 stars. Which would you like? Sentence11: first of all does the guesthouse have free internet? That is important. First things first. Sentence12: Sure what would you like to know? Sentence13: Great, thanks! I also need a place to stay, I'd prefer a guesthouse. Sentence14: What time would you like to leave or arrive by? Sentence15: Please let us know if we can assist you in the future. Have a great trip to Cambridge. Goodbye. Sentence16: Sure, there are several. Most are free. My favorite one with free admission is Kettle's Yard on Castle Street. It is on the West side, is that area ok? Sentence17: Sounds great! I think I have everything I need now. Thanks for all your help. Sentence18: Okay. I need a taxi between the hotel and the museum. Sentence19: Yes expect a red Ford to pick you up and his contact number will be 07816413809. Sentence20: Don't you have access to my previous requests? It would be from Kettle's Yard to the acorn guest house and I need to leave by 16:00. Sentence21: Hi, I would like info about museums I could visit on the west side. Sentence22: The acorn please. can you book that? Question: Who has spoken the sentence 11? (A) User (B) System
[EX A]:
Answer: (B) System