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

[EX Q]: Sentence1: No that's all I needed. Thank you! Sentence2: Mumford Theatre sounds great. May I have their address and entrance fee, please? Sentence3: The bridge guest house phone number is 01223247942. Can I help you with anything else? Sentence4: Hi, I'm traveling to Cambridge and I'm excited about tourist attractions. I'm looking for theatres in the centre of town. Sentence5: Can I please get their phone number as well? That's all I'll need for the day. Sentence6: I have many. May I suggest either The Cambridge Arts Theatre or Mumford Theatre? Sentence7: Unfortunately I am unable to find information on the entrance fee but the address is anglia ruskin enterprise, east road. Their phone number is 08451962320 Sentence8: Sure. The Bridge Guest House is at 151 hills road. Did you need any other assistance? Sentence9: Alright, thank you. I'm also looking for a particular hotel. It's called the Bridge Guest House, could you help me find it? Sentence10: You are very welcome, anytime. Question: Who has spoken the sentence 6? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: Yes, after 8:30 would be best. Sentence2: I have booked you a train ride on TR6488 which will depart at 09:21 and will arrive at 10:10. The total fee will be 10:24GBP. Would you like the reference number? Sentence3: No thank you. Thanks for your help. Sentence4: Great, thank you. That's all I needed. Sentence5: What is the total travel time? Sentence6: The post code is cb21ab and the phone number is 01223323737. Where would you like to book a train to? Sentence7: Where are you departing from? Sentence8: I would like the post code and phone number for the restaurant please, and I would like to book a train. Sentence9: The total travel time will be 49 minutes. Sentence10: You're welcome. Is there anything else I can do for you today? Sentence11: I'm leaving from Cambridge. Sentence12: I think something cheap. If not, go up to moderate. Sentence13: Do you have a time in mind? Sentence14: Good day to you. Sentence15: I suggest pizza hut city centre, it has a cheap price range. Would you like me to book it or would you like more information? Sentence16: Yes, Please book the reservation. Sentence17: I need to go to Stevenage on Sunday. Sentence18: I'd be happy to book a table for you. Please let me know the day, time, and the number of people in your party. Sentence19: There are nine of them. What price range do you prefer? Sentence20: I am looking for an Italian restaurant located in the centre of Cambridge. Question: Who has spoken the sentence 15? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: Unfortunately I need to leave after 09:30, is there one available then? Sentence2: Thank you for using our system! Sentence3: By travel time, I mean the duration of the train trip. Sentence4: That will probably work fine. Can you tell me the travel time for that train? Sentence5: No, that's not necessary. I can book it later. Thanks. Have a good day. Sentence6: The first train of Sunday leaves at 11:21 and arrives by 12:10. Does that meet your requirements? Sentence7: Thanks again. Goodbye! Sentence8: Thank you! Goodbye. Sentence9: I am leaving out of Cambridge. I need the ticket for Sunday. Sentence10: Sure thing, train TR8464 leaves at 11:21. Will that work? Sentence11: TR5390 is the first train of the day leaving at 5:21 would that work for you? Sentence12: I'm sorry. That comes out to a 49-minute train ride. Does that sound agreeable to you? Sentence13: Yes that will be fine. Sentence14: I need a train to Stevenage. Sentence15: Am I booking one ticket? Sentence16: Absolutely. From where would you like to depart? Question: Who has spoken the sentence 6? (A) User (B) System
[EX A]:
Answer: (A) User