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

[Q]: Sentence1: Where will you be travelling to? Sentence2: Yes but I need that to be booked for 3 people. I would like the reference number please. I also need a place to stay as well. Sentence3: Sure thing, I would suggest this one acorn guest house. Sentence4: I will be traveling to Leicester and would like to arrive before 21:15. Sentence5: I would like a 4-star guesthouse in the north in a moderate price range. Sentence6: Great can you book that for me from Sunday for 2 nights for 4 people. Sentence7: I would like to arrive by 21:15. Sentence8: When could you like to arrive by? Sentence9: Your booking was successful. Your reference number is 7ZJ4CTTG . Will that be all for today? Sentence10: Booking was successful, the total fee is 113.4 GBP payable at the station. Your reference number is ABKFF3SH . What type of place are you looking for? Sentence11: I'm looking for a train that leaves from Cambridge on Tuesday. Sentence12: I have the TR8207 that will arrive by 21:06. Would you like me to book that for you? Question: Who has spoken the sentence 4? (A) User (B) System
[A]: Answer: (A) User

[Q]: Sentence1: I'm just looking for something fun to do in the centre of town. Do you have any recommendations? Sentence2: I am checking on the train schedule from Peterborough to Cambridge. Sentence3: I will book it myself. Sentence4: What day do you want to depart? Sentence5: i want to depart on thursday. Sentence6: Can I get the phone number please? Sentence7: I also need an attraction. Sentence8: thank you and enjoy your stay. Sentence9: No thank you. That is all for today. Goodbye Sentence10: OK - is there anything else I can help you with today? Sentence11: TR418 leaves at 10:19. Whould you like me to book it? Sentence12: Sure many trains use that route. It would be helpful if you could narrow down a specific travel time. Sentence13: I want to leave after 10:00. Sentence14: Sure, their number is 08712240240. Is there anything else I can help with? Sentence15: Ok, I can help you with that. What type of attraction are you looking for? Sentence16: I'd recommend Vue Cinema. Would you like more information? Question: Who has spoken the sentence 13? (A) User (B) System
[A]: Answer: (B) System

[Q]: Sentence1: Have a wonderful day. Goodbye. Sentence2: If you go there, you are in for a treat. They have excellent food! They are moderately priced and located in the north. They are at 191 Histon Road Chesterton. Sentence3: Can you assist me in making a reservation for Friday? Sentence4: A hotel, please. I'm not worried about the price. Sentence5: I also need a taxi from the hotel to the restaurant. Sentence6: Would you like a guesthouse or hotel? Would you like it in the cheap, moderate, or expensive range? That will help narrow it down. Sentence7: Thank you, that is everything I need Sentence8: Booking was successful. Your reference number is : BNFZMVOX . Is there anything else you need assistance with today? Sentence9: Thank you, I will definitely try to do that. Bye. Sentence10: Sure. How many people will be in your party and what time would you like to dine? Sentence11: just that would be nice Sentence12: enjoy your stay Sentence13: Great can I book that for 3 nights for 7 people on friday? Sentence14: There are no hotels that match what you need. Would you be ok with booking a four star? Sentence15: I need a 5 star hotel too with free wifi. Sentence16: There will be 7 people at 11:15 on Friday please. Sentence17: I've booked a you a taxi, a blue volvo will come to pick you up. Their contact number is 07808756171 Sentence18: How about the allenbell it is a guesthouse located in the east it is also cheaply priced with 4 stars. Sentence19: Okay, what time are you leaving? Sentence20: I just need to arrive in time for my reservation at 11:15. Sentence21: I have successfully made a reservation for your party at the Golden Wok for Friday. Your reference is YCGV7GX9 . Is there anything else I can help you with? Sentence22: i am looking for a particular restaurant. Its name is called golden wok. Question: Who has spoken the sentence 12? (A) User (B) System
[A]:
Answer: (A) User