Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: Thank you. I would also like a train leaving on Saturday going to Kings Lynn. Sentence2: There are a variety of restaurants to chose from. Would you like Indian, Chinese, British, International fare or a Gastropub? Sentence3: Oh you're in luck. I have one in the center called Nandos City Center. Would you like me to make a reservation for you? Sentence4: Have a safe trip. Sentence5: Yes. I'd like to book that for two. Could I get the reference number please? Sentence6: For how many people? Sentence7: There will be 2 people. Sentence8: Well, I have great news. There are several trains leaving from Cambridge on Saturday. Would you like to book tickets for you and how many? Sentence9: Yes. Please reserve for 2 people on Tuesday at 15:15. Sentence10: It has been booked. Your reference number is 1J07UJKY . Sentence11: We would like to try a Portuguese place. Is there one available? Sentence12: Thank for the help, goodbye! Sentence13: Okay, where are you departing from? Sentence14: I am departing from Cambridge. Sentence15: Yes please book 2 tickets. Sentence16: Would train TR6633 arrving at 21:58 work? Sentence17: I need some help finding a place in Centre to eat, can you look it up for me? Sentence18: Let's try and narrow this down some. What time do you want to depart or what time do you want to arrive by? Sentence19: That booking was successful and your reference number is JM0RL39I . Sentence20: I would like to leave after 20:45 Question: Who has spoken the sentence 17? (A) User (B) System
Output:
Answer: (B) System