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: The address of the Nirala is 7 Milton Road Chesterton at the cb1uy postcode. Their number is 01223360966. Sentence2: Then may I suggest the a and b guest house? Sentence3: I want the cheap one. Sentence4: royal spice it is. Shall book it for you ? Sentence5: I also will need a taxi to pick me up at the hotel and get me to the restaurant by 02:15. Sentence6: Booking was successful your ref number is 1R8GSLHI, anything else today? Sentence7: On second thought, I'd like to go with Nirala? My friends want to try something a little more moderately priced. Can you give me the postcode, address and phone? Sentence8: What area would you like it to be in? Sentence9: Goodbye, enjoy your stay Sentence10: You have two options, The Nirala is moderately priced, royal price is cheap, any preference? Sentence11: I don't have a preference for what area, I do however want free WiFi. I would also like to stay in a guesthouse. Sentence12: The guesthouse is located on the east side at 124 tenison road. I am trying to book it but the system must be busy. I'll try again in a minute. Sentence13: Thanks that will be all for today. Goodbye. Sentence14: Yes, I'd like to find an Indian restaurant in the north please. Sentence15: I have booked grey volkswagen with contact number 07588046247. Anything else I can be of help? Sentence16: yes can you book it for 7 people and 3 nights starting from thursday ? Sentence17: I am looking to stay at a 4 star rated place in the moderate price range. Sentence18: Please try again Question: Who has spoken the sentence 10? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: What are the names of the 2 hotels? Sentence2: Sure, it's a nightclub in the centre area. Would you like the phone number or address? Sentence3: Allenbell is in the East area. can I get you a booking there? Sentence4: I need one in the east area. Is one of them in the east. Sentence5: The address is 1-6 corn exchange street and the postcode is cb23qf. Is there anything else I can help you with? Sentence6: I need place to stay in Cambridge. Want it cheap with 4 stars. Sentence7: No, if you could get me the postcode for Allenbell that would be great. Sentence8: What type of hotel is it, and do they have free parking? Sentence9: Allenbell is a guesthouse with free parking. Would you like me to check availability for a certain day of the week? Sentence10: Allenbell and the Alexander bed and breakfast are the cheapest. Sentence11: Thanks, that's all I need today. You've been a great help. Goodbye! Sentence12: Cool. Do you happen to know anything about the Soul Tree nightclub? Sentence13: The post code is cb13js Sentence14: I need the postcode and address. Sentence15: I found 2 different 4 star hotels in that are cheaper than the others. Would you like to reserve that room for you? Sentence16: Thank you for your interest in Cambridge, we look forward to seeing you here! Question: Who has spoken the sentence 1? (A) User (B) System
[EX A]:
Answer: (B) System