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

Sentence1: Great I also need a taxi to take me between the two places and get me to the restaurant by 20:00 Sentence2: You are most welcome. May I help you with anything else, such as attractions? Sentence3: The University Arms is a 4 star hotel on Regent Street. Would you like me to make a reservation there? Sentence4: Booking was successful. Reference number is : VJQM2DFY . Anything else I can do for you? Sentence5: Is that in the centre area also, and in the expensive price range? That is what I'm looking for. Sentence6: In the centre, please Sentence7: Perfect!. Thank you for your help! Sentence8: Great, can you book for 1 person and 4 nights starting Wednesday. Sentence9: Have a great day! Sentence10: Yes, University Arms Hotel is a 4-star hotel in the expensive price range. Would you like to make a reservation? Sentence11: There are 33 expensive restaurants in the centre of town. Is there a specific type of cuisine you were looking for? Sentence12: Sure, which part of town did you want to eat in? Sentence13: Booking for the taxi complete look for a grey bmw car contact number is 07434690950 to arrive at the restaurant by 20:00 Sentence14: You have been booked at the Bedouin on Wednesday at 20:00 for 1 person. Your reference number is 29KJKZOD . Is there anything else I can help you with? Sentence15: I'm visiting the centre and want to go all out on the experience. Can you help me find an expensive restaurant? Sentence16: I need a place to stay. Sentence17: no, just surprise me. I need a reservation for 1 person at 20:00 on wednesday. Sentence18: No thanks, that's all I needed. Question: Who has spoken the sentence 15? (A) User (B) System
Answer: (B) System

Sentence1: Can you book a table at the Bistro for me? 4 people at 13:30 on Sunday, please. Sentence2: I am looking for a place to eat that's expensive and serves Belgian food. Sentence3: I just need the arrival time and price. Sentence4: I have two, the backstreet bistro and the slug and lettuce. Do you have a preference between the two? Sentence5: Yes, what time do I need to be at the station? Sentence6: How about somewhere expensive in the centre? Sentence7: Booking was successful. The table will be reserved for 15 minutes. Reference number is : NSLKEI1G . Sentence8: I want to leave after 10:30 on Monday. Sentence9: The TR8089 meets your criteria. Would you like to book tickets? Sentence10: You're welcome, have a good day. Sentence11: no such restraunts too Sentence12: Thanks! I also need a train from Cambridge to Ely, please. Sentence13: what time will you be departing? Sentence14: I should be asking you what time you need to be at the station. Sentence15: The arrival time for train TR8089 is 12:07, and it will cost only 4.40 pounds. Is there anything else I can help with? Sentence16: I'm sorry, we don't have any Belgian restaurants. Would you like to try a different type? Sentence17: That was everything. Thanks very much! Sentence18: How about a gastropub restaurant? Question: Who has spoken the sentence 1? (A) User (B) System
Answer: (B) System

Sentence1: Thank you goodbye Sentence2: I need a hotel in the south Sentence3: Yes the Lensfield Hotel does have parking. Would you like me to book it? Sentence4: The lensfield hotel is in the south. Do you want me to book it for you? Sentence5: does it include free parking? Sentence6: It's been my pleasure. Have a great stay in Cambridge. Question: Who has spoken the sentence 2? (A) User (B) System

Answer: (A) User