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

[EX Q]: 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
[EX A]: Answer: (B) System

[EX Q]: Sentence1: Thank you. That's all I need. Sentence2: I was able to book it, reference number is T2SNWPJA Sentence3: Okay, the Mahal of Cambridge serves indian food and is located in the centre. Would you like me to make a reservation for you? Sentence4: I am happy to help, what was the name of the place? Sentence5: Its the huntingdon marriot. I'd like to book it for 8 people on 2 nights starting on wednesday, and I'll need a reference number. Sentence6: Can you help me look up a particular hotel that I have in mind? Sentence7: Great, thanks for that. I'm also looking for information about a restaurant called mahal of cambridge. Sentence8: Yes please book a table on Wednesday for 8 people at 17:15, I'll need a reference number. Sentence9: It was my pleasure to help. Have a wonderful night. Take care. Bye. Sentence10: Your booking was successful reference number is 1QVLVD25 Question: Who has spoken the sentence 3? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: When will you be traveling? Sentence2: Thanks. I am also looking for a train to Broxbourne from Cambridge. Sentence3: Train TR9531 leaves Cambridge at 16:01 and arrives in Broxbourne at 17:01. That is the last train of the day. Would you like to make a reservation? Sentence4: Yes, please. I need 7 tickets. Sentence5: Did you have a specific departure or arrival time in mind? Sentence6: The price range is on the expensive side and I would like if they provide free wifi and parking. I want the hotel to be located on the north side. Sentence7: I need to arrive by 18:00, please. Sentence8: Your reference number is 4HRLU45B, is there anything else you need? Sentence9: Yes, I would like to find a hotel in the south. Sentence10: We don't have any hotels that fit your criteria. Would you like to search for something a little different instead? Sentence11: I am leaving on Thursday. Sentence12: Thank you for using the Cambridge TownInfo centre. Goodbye. Sentence13: Hi, I could use some help with information on places to stay. Sentence14: Okay, the booking was successful. The reference number is FGOM35JV . Sentence15: No, that's all I need from you, Thanks! Sentence16: That sounds perfect. I need it for 3 nights and 7 people will be staying starting Monday. Sentence17: The Lensfield Hotel at 53-57 lensfield road is a fabulous 3 star hotel that offers internet and parking. Would you like me to book you a room there? Sentence18: Yes, I can help with that. What area would you like to stay in and what is your price range? Question: Who has spoken the sentence 16? (A) User (B) System
[EX A]:
Answer: (A) User