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

[Q]: Sentence1: Can you check a swimming pool in the west of the city? Sentence2: Yes, there are no swimming pools located to the west of your city. Thank you, if you need help with anything else, contact us again. Sentence3: No thank you, that's all I needed. Sentence4: I have 3 hotels and 2 guesthouses in town centre. Would you like a cheap price range or expensive? Will you also need parking? Sentence5: Okay! Goodbye! Sentence6: I would prefer a guesthouse, and it does not need to include internet. Sentence7: If you change your mind and need a booking, we'll be here. Thanks for using our service! Sentence8: I'd prefer one in the same part of town as my hotel, are you sure there isn't one? Sentence9: We currently do not have any shown attraction in that area you are looking for. Are there any other further things I could assist with? Sentence10: Goodbye. And feel free to contact us if there's any other information you need, as well. Sentence11: The alexander bed and breakfast is a guesthouse in town centre in the cheap price range with a 4 star rating. Would you like to book a room? Sentence12: I am looking for a place to stay in the centre in Cambridge. Sentence13: I'm not showing a swimming pool in the East, but there are 2 in the North, will that work? Sentence14: I am also looking for an attraction, a swimming pool Question: Who has spoken the sentence 13? (A) User (B) System
[A]: Answer: (B) System

[Q]: Sentence1: Ok, that would be great. Can I get the reference number please? Sentence2: Sure, and make me a booking for 7 people. Sentence3: I'll be departing from Cambridge on Wednesday. Sentence4: Yes I need a train going to birmingham new street leaving after 18:15. Sentence5: I have Hughes Hall, 01223334898, with free entrance. The broughton house gallery at 01223314960, also free. I don't seem to have any churches. Can I help you further? Sentence6: there are some great museums, colleges and churches for you to visit. Sentence7: Please recommend some worthwhile places to visit in the centre. Sentence8: Have a wonderful visit. Thank you for using Cambridge TownInfo Centre. Goodbye. Sentence9: I will go ahead and book that for you. Sentence10: Great, I would like to get some phone numbers for those places in the centre. Sentence11: Where will you be departing from, and on what day? Sentence12: Thank you. That's all I need for today. You've been a great help. Sentence13: There are five trains leaving on Weds. Do you want me to pick one to book? Sentence14: TR9236 leaves cambridge on wednesday on 19:01 and arrives at birmingham new street at 21:44. I have booked 7 tickets. Your Reference number is : 2BGY3ZRW . Question: Who has spoken the sentence 6? (A) User (B) System
[A]: Answer: (A) User

[Q]: Sentence1: I don't really care. Sentence2: The postcode for the Ballare is cb23na. Would you like any other information? Sentence3: I am looking for an Italian restaurant in the centre of town. Sentence4: You are welcome. Have a marvelous time in Cambridge. Thank you for reaching out to Cambridge TownInfo centre. Goodbye. Sentence5: Great. Can I get the information about one of them? Sentence6: Booking was successful. The table will be reserved for 15 minutes. Reference number is : DL0PXR9G . May I help with anything else ? Sentence7: that is it for today thanks. Sentence8: Can you tell me if you happen to have any nightclubs in town? Sentence9: Absolutely. What price range are you looking for? Sentence10: For the reservation of the taxi, can you tell me your pickup and drop off locations? Sentence11: I'm sorry, there's someone talking here and getting me turned around. I'd like a taxi from the nightclub to the restaurant, early enough to make my reservation. Sentence12: You want a train from Ely to Cambridge, is this right? I also need a travel date and departure or arrival time. Sentence13: i have booked a yellow volvo with contact 07259480629 Sentence14: Sure the Ballare costs 5 pounds to get in and is located in the center at Heidelberg Gardens, Lion Yard. Sentence15: I also need a taxi. Sentence16: stazione restaurant and coffee bar is an italian restaurant in the centre area. would you like me to make you a reservation? Sentence17: Yes please, four people on tuesday at 18:00 Sentence18: What is the postcode for that one? Sentence19: Yes Ely to Cambridge please. Thanks Sentence20: yes we have 5 all in the centre of town. Question: Who has spoken the sentence 19? (A) User (B) System
[A]:
Answer: (B) System