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: I am looking for Mediterranean food in the center of the city. Sentence2: I show 3 available. 2 are in the expensive range and 1 is cheap. May I book a table for you? Sentence3: Thanks for calling. You have a great day! Sentence4: I have booked you at the Shiraz Restaurant for 7 people Saturday at 15:45. Your table will be reserved for 15 minutes. Sentence5: I'd like the expensive range and I'd like to book a table for 7 people on Saturday at 15:45. Sentence6: Great. Thanks so much! Sentence7: Thank you so much. That is all I need today. Have a great evening. Sentence8: Sure. Your reference number is MSV3UPS2 . You will likely need it. Question: Who has spoken the sentence 4? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: Yes, they can be reached at 01223902112. Is there anything else I can help you with? Sentence2: Thanks for contacting us enjoy your stay with us! Sentence3: Yes. There will be 6 of us dining. Sentence4: Camboats is a boat attraction in the east area of town. Would you like more information about them? Sentence5: Hello, do you know of any boat attractions in the East of town? Sentence6: Your booking was successful, here is your reference number JLI059GG . Sentence7: Monday, 14:15. Please include the reference number. Sentence8: There is one option here. It is pizza hut fen ditton. Would you like a table reserved? Sentence9: Thanks, that'll be it for me today. Bye! Sentence10: I don't have any information on their entrance fee, but their postcode is cb58sx. Sentence11: Yes, I'm also looking for a moderately priced italian restaurant preferably in the same area as camboats Sentence12: Yeah, can I get the entrance fee and postcode? Sentence13: What day and time do you want me to book it for? Sentence14: I can give Camboats a call. Do you have their phone number? Question: Who has spoken the sentence 10? (A) User (B) System
[EX A]:
Answer: (A) User