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

Example Input: Sentence1: Could you check the spelling(city centre north b and b) and try to search again? Sentence2: The TR2512 takes 51 minutes. Anything else you need? Sentence3: I will be traveling on Thursday. Sentence4: It is a cheap, 0 star guesthouse located at 328a histon road on the north side. It has free internet and parking. Phone number and postcode are 01223312843 and cb43ht. Sentence5: Yes I am looking for information on a hotel called City Center North B and B. Sentence6: Sure! give me the following information: Day of visit, number of people and number of days that you will be staying. Sentence7: I cannot find that hotel. Any other hotels you would like to find? Sentence8: You're all set. Your reference number is HOSVDEGA . Can I help you with anything else today? Sentence9: Do you have a time preference? Sentence10: Well that will not work. Sentence11: I need to arrive by 14:15. Sentence12: there are many trains but you need to tell us which day you want to travel Sentence13: I am also looking for a train into Cambridge from London Kings Cross. Sentence14: Please book for 2 people starting on thursday for 4 nights. Sentence15: enjoy your stay in Cambridge! Sentence16: The TR2512 will fit your needs. Would you like to book this train? Sentence17: The first train leaves at 5:17. Sentence18: Thank you. Are you able to book that for me? Sentence19: Not at this time. What is the travel time for that train, please? Sentence20: no that will be all thanks Question: Who has spoken the sentence 19? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: Let's go with the cheap one. I'll need a table for 7 on Sunday at 12:15 please. Sentence2: Can you try on saturday, 7 people, at 12:15 Sentence3: you're in luck I have two options for you. One is in the cheaper price range, the other is listed as moderately priced. Do you have a preference? Sentence4: Unfortunately the booking was not successful. Sentence5: Yes, you're booked for Saturday with reference number V54FG5X2 . The table will be reserved for 15 minutes. May I help with anything else? Sentence6: Thank you, goodbye! Sentence7: No, that's all I need. Thanks for your help! Sentence8: Yes I would like to find Spanish food in the center of town. Question: Who has spoken the sentence 7? (A) User (B) System
Example Output: Answer: (B) System

Example Input: Sentence1: I need to get a train going to Stevenage. Sentence2: I will need some more information. The train is departing from cambridge correct? What day would you like to leave? Sentence3: How about TR5343? It leaves at 15:21. Your next choice is TR9883 which leaves at 17:21. Sentence4: It is 12.80 pounds. Sentence5: No, not at this time. Thank you. Sentence6: jesus green outdoor pool and kings hedges learner pool are in that area. Could I get you info on one of those? Sentence7: I would like information on pools in the north. Sentence8: Sure, the phone number for jesus green outdoor pool is 01223302579. The address is listed as between victoria road and the river. Sentence9: thanks! that's all i need now Sentence10: Okay glad I could help. Sentence11: What is the price for TR5343? Sentence12: Is there any other info or booking I can do? Sentence13: Yes, departing from Cambridge. We'll be leaving on Tuesday, hopefully after 15:15. Sentence14: How about Jesus Green Outdoor pool. Could I have their address and phone number. Question: Who has spoken the sentence 1? (A) User (B) System
Example Output:
Answer: (B) System