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

[EX Q]: Sentence1: Unfortunately, no. La Margherita is an italian place. And, Thanh Binh serves vietnamese. Sentence2: Would you like for me to make you a reservation? Sentence3: Thank you for using the Cambridge Town Info Centre Services! We hope you enjoy your time in Cambridge Sentence4: yes, I want to book a table for 6 people at 12:00 on sunday. Sentence5: Booking was successful. The table will be reserved for 15 minutes. Reference number is : H0BFXWTP . Can I help you with anything else today? Sentence6: Yes, book that for 6 people. I would also like the reference number. Sentence7: Where would you like to go to? Sentence8: Thanh Binh would be perfect. Sentence9: Certainly! There are two great restaurants that meet your criteria. The first in La Margherita and the second is Thanh Binh. Would you like more information on one of them? Sentence10: Your booking was successful. The total fee is 113.28 GBP, which is payable at the station. Your reference number is A5ZWGBQ3 . Sentence11: Yes, could you find me a train from ely that same day? Sentence12: thanks so much you have been very helpful Sentence13: Does it serve creative food? Sentence14: TR3207 will arrive by 07.51. Should I book it? Sentence15: Can you help me find a cheap restaurant in the west side of town? Sentence16: I would like a train to Cambridge, arriving by 09:45. Question: Who has spoken the sentence 10? (A) User (B) System
[EX A]: Answer: (A) User

[EX Q]: Sentence1: That was a successful booking, your reference number is T6C83P46 . Sentence2: Thank you so much! Sentence3: Not really. Anything would be fine. Sentence4: Yes, please. I'd like to book it for 6 people and 5 nights starting from monday. Sentence5: I'm not too concerned with location, but I would like it to include internet and have a 4 star rating please. Sentence6: Do you have a preferred location or price range? Sentence7: Yes, how about 3 nights? Sentence8: I recommend the Acorn Guest House. Would you like a room there? Sentence9: I'm looking for a guesthouse with free parking. Sentence10: Booking unsuccessful. Want to try for a shorter stay? Sentence11: There are 16 guesthouses that meet those requirements. Any preference on price range? Sentence12: You're so welcome. Thank you. Question: Who has spoken the sentence 1? (A) User (B) System
[EX A]: Answer: (B) System

[EX Q]: Sentence1: Thank you for using the Cambridge TownInfo centre. Have a nice day! Sentence2: I don't care about the price. Sentence3: No thanks, but could I please have the postcode? Sentence4: Ok then. I suggest the oak bistro. It's located at 6 Lensfield Road. Would you like a reservation? Sentence5: Please help me find a restaurant that serves british food near the centre of town. Sentence6: No problem. Did you need anything else? Sentence7: The post code is cb21eg. Can I assist you further? Sentence8: The phone number is 01223323361. Sentence9: Nope, that covers all my needs. Thanks. Sentence10: Can you please tell me the phone number? Sentence11: There are seven restaurants in the centre of town that serve british food ranging from moderate to expensive. Is there a particular price range you are looking for? Sentence12: Great, thanks for all your help. Question: Who has spoken the sentence 5? (A) User (B) System
[EX A]:
Answer: (B) System