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

Sentence1: Thank you for your help. Sentence2: do you have one with a star of 4? Sentence3: You're welcome, and have a great day. Sentence4: yes please tyhat you for all your help Sentence5: OK, you have 7 tickets reserved on TR6939. Total due at the station will be 116.2GBP. Your reference number is OK7WYTNQ . Sentence6: Try either one of the cheap ones, I need one that can hold my group of 7 for 5 nights on tuesday. Sentence7: Yes, I'll need 7 tickets. Sentence8: I also need a place to stay. 2 star is my preference. Sentence9: I would like to arrive in Cambridge by 08:45. Sentence10: We have 10 different trains on that day. Do you prefer a particular time? Sentence11: No, thank you. That will be all. Sentence12: TR6939 is your best option. It will leave at 05:39 and arrive at 07:07. Would you like to book passage on that train? Sentence13: In the west part of town. The price doesn't matter. Sentence14: the cambridge belfry was the best match for a large group so I booked you there, the reference number is X33MYBK5 , may I assist with anything else? Sentence15: Have a great time. Sentence16: I do. We have three options. Two that are cheap and one that's expensive. Do you have a preference? Sentence17: I need help finding a train. Can you do that? Sentence18: I don't have any 2 star hotels in that area. Would you like a different area or a higher rated hotel? Sentence19: Okay, do you need a reference number? Sentence20: Of course. Where are you traveling to? Sentence21: I would like to leave Liverpool street on Tuesday and arrive in Cambridge. Sentence22: okay, what area and price range? Question: Who has spoken the sentence 15? (A) User (B) System
Answer: (B) System

Sentence1: The Warkworth House is a guesthouse in the East, it's moderately priced and rated 4 stars. I would love to assist you in booking a room if you would like? Sentence2: There are 5 parks in town. Did you have a certain area you prefer? Sentence3: It's actually not a museum, but considered an architecture attraction. Were you interested in a specific type of attraction? Sentence4: Cambridge university botanic gardens is a beautiful park. Its located at bateman street, costs 4 pounds to get in. Phone 01223336265, cb21jf. Will you need transportation? A train, taxi or bus? Sentence5: have a good day Sentence6: No, Is that a museum or a church. Sentence7: Oh, I suggest my favorite! It's Holy Trinity Church, beautiful architecture, and it's located on Market Street. It's free. Would you like their phone number? Sentence8: I have you at the Warkworth house. Would you like to change the reservations? Sentence9: i am looking for somewhere to go in the centre of Cambridge Sentence10: I think we would like it to be in the centre of town please. Sentence11: Yes your reference number is 53LJQ4H6 . Sentence12: No. That's perfect! Thanks for your help. Good bye. Sentence13: Yes, please. Can you reserve a room for Monday for 5 people, 3 nights? Sentence14: no. also find me a hotel by the name warkworth house Sentence15: Actually, I will need to book lodgings as well. Sentence16: Thanks! Can you suggest to me something to visit that isn't a church or architecture? Maybe a museum or a park? Question: Who has spoken the sentence 15? (A) User (B) System
Answer: (B) System

Sentence1: Their phone number is 01223503333, and their postcode is CB23PJ. Can I help you with anything else? Sentence2: Thanks for the theatre info. Let's go back to the restaurant search. I feel like Spanish food, in the moderate price range, please. Sentence3: Can the taxi pick me up from the Cambridge Arts Theatre. Sentence4: Where would like the taxi to take you? Sentence5: La Tasca sounds perfect for you. Would you like me to book it? Sentence6: That's all for now. Thank you for all your help. Sentence7: I will also need to book a taxi. Sentence8: You are booked with reference number NK0DZ1YI . Anything else? Sentence9: yellow audi Contact number : 07845910981 Is there anything else I can assist you with? Sentence10: Ok. I will be happy to help you with that. Where will the taxi pick you up? Sentence11: Yes, please book for 5 people on tuesday at 14:30. And I will absolutely need a reference number from you Sentence12: Hello, can you recommend local restaurants? Sentence13: Great, thanks for letting us help you! Sentence14: I have many options for restaurants in the area. Is there a certain type of food you would like me to find information on? Sentence15: To La Tasca, by 14:30 Sentence16: No. I am interested in the Cambridge Arts Theatre. Can you provide me with the phone number and postcode? Question: Who has spoken the sentence 11? (A) User (B) System

Answer: (B) System