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

[EX Q]: Sentence1: I have 5 choices for you. If I might suggest the Holy Trinity Church. It has the most unique architecture in our area. They also offer free admission. Sentence2: I will be visiting the centre. Sentence3: Like I mentioned, Holy Trinity Church is totally free. Is there anything else you'll be needing today? Sentence4: Sounds great. Do you happen to know the entrance fee for it? Sentence5: OK I HAVE 1 TRAINS THAT LEAVE AROUND THAT TIMES ONE AT 21:39 WOULD THAT WORK FOR YOU ? Sentence6: I need a train that lease from London Liverpool Street on Tuesday. Sentence7: Yes as long as it leaves AFTER 20:45 that will be fine. How much is it and how long is the travel time? Sentence8: There are 10 days departing London Liverpool Street on Tuesday. Is there a certain time of day you need to travel? Sentence9: No, I don't think so! Thank you for your help! Sentence10: How about architecture type instead? Sentence11: Thank you for using Cambridge TownInfo centre. Please remember us for all of your future travel needs. Sentence12: Which area are you interested in visiting in town? Sentence13: I would like to leave after 20:45. Sentence14: the train ride is 88 minutes and the cost is 16.60 pounds. it leaves at 21:39 and your reference number is Q6UN1GVR . is there anything else i may help you with? Sentence15: There is no entertainment in the centre. Would you be interested in a different type of attraction? Sentence16: I am looking for places to go in town. What type of entertainment is there in the centre? Question: Who has spoken the sentence 4? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: Frankie and Bennys serves italian food in the expensive price range, and their postcode is cb17dy. Would you like assistance in making a reservation? Sentence2: Departure time doesn't matter, I just need to arrive at the stansted airport by 21:30 on Thursday, and I need to depart from Cambridge. Sentence3: When are you leaving? Sentence4: I don't need tickets at the moment, but I do need the price and train ID for that 19:40 departure, please. Sentence5: I need a train that leaves Cambridge on Thursday. Sentence6: There are 202 trains leaving Cambridge on Thursday. Would you like to narrow your search by destination and time? Sentence7: Can you tell me the postcode, food type, and the price range? Sentence8: The train id for that is TR9030 and the price is 10.10 pounds. Is there anything else you'd like help with today? Sentence9: I am going to the stansted airport and I need to arrive by 21:30. Sentence10: Yes, the 19:40 train will arrive at 20:08. How many tickets would you like? Sentence11: I'm also looking for a particular restaurant, it's called Frankie and Benny's. Sentence12: Thank you for contacting the Cambridge TownInfo centre. We're here any time you need to get around Cambridge! Sentence13: No, that's all I needed. Thank you. Sentence14: Can I please have one at 19:40. I will get there by 21:30 correct? Sentence15: I was able to find it, what information would you like on it? Sentence16: I have 16 train departures fitting your preferences. They leave every :40 of the hour starting at 5:40 to 20:40, would you like me to book one of these? Question: Who has spoken the sentence 10? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: I've made those reservations and your reference number is N90KBZUM Sentence2: Thanks a lot. That is all I need. Sentence3: Train TR2232 leaves Liverpool Street, London at 17:39 and arrives at 19:07. Would this work for you? Sentence4: how about TR9886? it arrives at 19:07 on Friday. Sentence5: Is it expensive? Sentence6: Yes that works. Go ahead and book me 7 tickets please Sentence7: Your booking was successful and your total cost is 116.2 GBP. Your reference number is BWXB511A . Sentence8: ashley hotel is a moderately price hotel in the north area. Would you like me to book a room for you? Sentence9: I would prefer one in the expensive range if you have any. Sentence10: Great thank you so much. Sentence11: ashley hotel is a great place with free wi fi Sentence12: The express by holiday inn is an expensive 2 star hotel in the east. They have free parking and free wifi. Will this work for you? Sentence13: Thanks again, goodbye. Sentence14: Yes. I need to book for 7 people starting on Wednesday and staying for 2 nights. Sentence15: Great! Can you please help me with finding a train as well? I need something leaving london liverpool street after 16:30. Sentence16: Have a great trip. Goodbye. Sentence17: Actually, can we try for Wednesday? I'll need tickets for the same group of people. Sentence18: I'm looking for a hotel that includes free wifi. Question: Who has spoken the sentence 15? (A) User (B) System
[EX A]:
Answer: (B) System