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

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: Booking was unfortunately unsuccessful. Can we try another day or a differen't time slot? Sentence2: Yes, please book a table for 4 people at 19:00 on Sunday. Thank you. Sentence3: Do you have anyplace that serves Chinese food? Sentence4: OK I will go with Italian food and pick the Pizza hut cherry hinton. Thank you for your help. Sentence5: Have a great day! Sentence6: Good news! Your reservation has been booked for Sunday at 18:00 for 4 people. The reference number is YJ0B5W19 . Is there anything else I can help you with? Sentence7: There are 2 options. Pizza hut cherry hinton serves Italian food and Restaurant alimentum serves modern European food. Sentence8: Would you like me to book that for you? Sentence9: I'm sorry, there are no Chinese restaurants located in the south that is moderately priced. Sentence10: How about 18:00? Sentence11: Hello. Could you help me locate a good moderate restaurant in the south of the city? Sentence12: That is all! Thank you! Question: Who has spoken the sentence 10? (A) User (B) System
Answer: (A) User

Sentence1: Thank you and enjoy your meal. Sentence2: Thank you, you, too. Sentence3: Yes book for 7 people on tuesday for 15:30 please. Sentence4: Have a good day Sentence5: Okay, I've booked you at Travellers Rest, which also serves british food. Your reference number is FOEJZBZI . Anything else I can help with? Sentence6: That's too bad. Please book any other restaurant that is in the west and expensive. Sentence7: I'm sorry, that booking was unsuccessful. Shall I try for another day or time? Sentence8: I'm looking for a restaurant called graffiti. Sentence9: Graffiti is an expensive British restaurant in the west. Would you like me to book it for you? Sentence10: That is all, thanks. Question: Who has spoken the sentence 3? (A) User (B) System

Answer: (B) System