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

Sentence1: Right, Saturday, did you have a time you want to leave by? The trains leave every 30 minutes starting at 5:19 Sentence2: No I think that will be it, thank you for your help! Sentence3: Your booking was successful. Reference number is PR8JE3DU and total is 39.59 GBP. Can I help you with anything else today? Sentence4: Saturday from Peterborough to Cambridge for 3 people. I will need the reference number too please. Sentence5: It doesn't matter when I leave, as long as I arrive by 12:45. Sentence6: I wish to arrive before 12:45. Sentence7: There are 38 trains from Peterborough to Cambridge on Saturday, all throughout the day. Can narrow down the time of day you wish to travel? Sentence8: Yes, for the same group of 3 people from before. Sentence9: I am looking for moderately-priced three-star guesthouse in Cambridge. Sentence10: There are four guesthouses that meet your criteria. Do you need internet or parking? Sentence11: I have booked your stay at the alpha-milton guest house. The reference number is HS3MWJ10 Sentence12: I have located one hotel matching your search criteria, the Alpha-Milton Guest House. The phone number is 01223311625. Would you like to make a reservation? Sentence13: Sure. I will need to know how many people you would like to book it for, what day you would like and how many days you would like to stay. Sentence14: TR5538 leaves at 11:48 and will arrive by 12:38. Would you like for me to book this train for you? Sentence15: I'll need the reservation for 3 people starting Saturday for 4 nights. Sentence16: I would like to call them myself please. Thank you. Sentence17: Thank you, I will also need a train from Peterborough to Cambridge on Saturday. Is there anything available? Sentence18: Sure. Is there anything else I can help you with today? Sentence19: Yes please. Can I actually have you book them? I need the reference number as well. Sentence20: There are 14 trains arriving by that time. When would you like to leave? Sentence21: You're welcome. Enjoy your time in Cambridge! Sentence22: It doesn't need to have free parking and I don't care about the internet. Which guesthouse can accommodate for 3 people? Question: Who has spoken the sentence 13? (A) User (B) System
Answer: (B) System

Sentence1: Yes, I would like a moderate price range with a 3 star rating. It doesn't need free internet. Sentence2: Yes!, Please find a reservation of a restaurant that serves Turkish food. Sentence3: Can you recheck the same area that has free wifi? Sentence4: Yes please, can i have the reference number? Sentence5: Did you book me at Anatolia Turkish? I need to book for 6 on Thursday at 17:30. Sentence6: I will get that for you now. Sentence7: Sorry I missed it before, I did find a moderately priced guesthouse in the west with Internet. The Hobson house. Shall I make a reservation? Sentence8: It is. On what day will you be checking in, for how many nights, and how many people? Sentence9: I have your booking for the Hobsons House. Your reference number is A4UULB11 . What else can I do for you today? Sentence10: Have a nice day. Sentence11: yes, if it has a three star rating Sentence12: You are booked at the Anatolia. Your reference number is IS9T6H2A . The table will be reserved for 15 minutes. May I help with something else? Sentence13: I have all price ranges and some guesthouses. Any preferences? Sentence14: Great Thanks for all your help. Sentence15: It will be for 6 people for 5 nights starting from Thursday.Can you get me the reference number? Sentence16: I have anatolia turkish located in the centre. It is moderately priced would you like to make reservations? Sentence17: my records shows nome. can we change location? Sentence18: I can go ahead and book that for you now. Sentence19: I'm looking for a restaurant in the same price range as the guesthouse, one that serves corsica food. Sentence20: Once you find the restaurant you want to book a table for the same group of people at 17:30 on the same day. Sentence21: I need a place to stay in the west of town. Sentence22: there is no place they serve corsica food. can you change the cuisine? Question: Who has spoken the sentence 17? (A) User (B) System
Answer: (B) System

Sentence1: Your booking was successful! Your reference number is EV4ADBI9 . Sentence2: I need it for Sunday. Sentence3: Yes. Let's book it. Sentence4: I would like it to be in the west. It doesn't matter if it has free parking or not. Thank you! Sentence5: There are four three star guest houses. Is there an area of town that interests you the most? Sentence6: Train TR3154 leaves cambridge at 13:06 and will arrive at peterborough at 13:56 on Monday. Would you like me to book a ticket? Sentence7: I am looking to stay at a guesthouse that has a 3 star rating. Sentence8: ok for how long and how many people please Sentence9: I want a train that goes to peterborough and leaves after 13:00 Sentence10: Does it leave on Monday? Sentence11: There is the hobsons house. Would you like me to book it? Sentence12: For 3 days and 2 people,I need a confirmation number too Sentence13: and what day do you need the reservation for? Sentence14: The next train is the TR0545 leaving cambridge at 13:06. Would you like me to book it or more information? Question: Who has spoken the sentence 12? (A) User (B) System

Answer: (A) User