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

[EX Q]: Sentence1: Booking was successful for Tuesday. Your Reference number is : 0J3V1091 . Sentence2: I'm sorry that doesn't seem to be available would you like me to try a different day or guesthouse? Sentence3: I'm sorry, there does not seem to be a historical site or hiking area in Cambridge. Is there anything else I can help with? Sentence4: Sure, I can help you with that. What section of town were you looking for? Sentence5: Doesn't really matter if they offer either of those or not. I just want it to be a 0 star hotel. Sentence6: Then the city centre north b and b is what you want, shall I book you? Sentence7: i don't really care about the area. Sentence8: I want to see local sights, can you help? Sentence9: I like hiking and seeing historical sites. Sentence10: Okay. Are you interested in hotels that offer internet and/or parking? Sentence11: Yes, I would like to find a hotel in the cheap price range? Sentence12: Yes, a guesthouse is fine. I was looking for zero stars and in the cheap price range. Sentence13: Great, thanks. I don't need anymore help. Goodbye! Sentence14: Yes, please book it for me. Sentence15: I'm sorry, I seem to be having an error in my system. You want a booking at the citycentre north B&B for 6 people, 5 nights, on Monday? Sentence16: I'm also looking for somewhere to go. Perhaps the college. Can you tell me the postcode for the college? Sentence17: City Cenrtree North and B is a cheap hotel,would you like me to book it for you ? Sentence18: Let book the same but on Tuesday instead. Sentence19: I'm happy I could help today. Goodbye! Sentence20: There are 18 colleges in town. I recommend christ's college in the centre. The postcode is cb23bu. Sentence21: Yes, there is a wide variety, do you have an activity type that your are interested in? Sentence22: Yes please, 6 people for 5 nights and we would be arriving Monday. Question: Who has spoken the sentence 21? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: I am looking for a place to stay Sentence2: Sala Thong serves Thai food and is located at 35 Newnham Road, Newnham cb39ey. Their phone number is 01223323178. Can I help with a booking? Sentence3: Thank you! Good bye. Sentence4: There are a lot of guesthouses that meet that criteria. Do you want to stay in a particular area? Sentence5: let's book it for wednesday please. Sentence6: Yes. Where is a good expensive restaurant in the West area of town? Sentence7: What's the address, postcode and phone number of the thai restaurant? Sentence8: I think we're jumping way ahead of ourselves here. Let's start afresh. Please get me the address to the acorn and then we can proceed with getting a taxi Sentence9: There's british, european, indian, and thai. Sentence10: What day and time would you like me to reserve the restaurant for? Sentence11: No, I don't care about the location. I do want a 4 star place though. Sentence12: I'm looking for a guesthouse with free parking and free wifi. Sentence13: I will definitely be able to help you with that. Did you want a hotel or a guest house? Sentence14: Yes can you please book that for me? Sentence15: Can you give me some examples of the type of cuisine that is available? Sentence16: There are nine expensive restaurants in the west, is there a particular type of food that you are interested in? Sentence17: Thank you for calling Cambridge TownInfo centre. It was a pleasure to help you. Sentence18: The acorn guest house has a 4 star rating and is in the moderate price range. It is in the north area. Would you like to reserve a room? Sentence19: The address to acorn is 154 chesterton road. Sentence20: How many people will the booking be for and what time would you prefer the booking to be at? Question: Who has spoken the sentence 14? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: I was able to book the train, TR3844, for 30.29 total fee, which you may pay at the station. Reference number is 1PISWDKF . May I be of anymore assistance? Sentence2: That is all. Thanks so much! Sentence3: Can we book that place for, say, same number of people at 10:00 on the same day, please. Sentence4: I have 2, Prezzo - moderately priced and La Margerita - cheap, which one do you prefer and when would you like the reservations? Sentence5: Where are you going and on what day would you like to travel? Sentence6: Also looking for an Italian restaurant in the West. Sentence7: Booking was successful. The table will be reserved for 15 minutes. Reference number is : 78MCBK84 . Is there anything else? Sentence8: Hi, I'm looking to book a train to Cambridge. I need it to arrive by 14:15. Sentence9: I am going to bishops stortford and traveling on wednesday. Please reserve 3 seats and provide the reference number, thank you! Sentence10: Where will you be departing from? Sentence11: Yes, let's go with La Margerita. I don't need reservations, thank you. Sentence12: Thank you for contacting us and have a nice day. Sentence13: I will be departing from Cambridge. Sentence14: Is there anything else I can do for you today? Question: Who has spoken the sentence 5? (A) User (B) System
[EX A]:
Answer: (B) System