Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: I just need one ticket please. I need the train price as well. Sentence2: Thank you that is all I needed today. Sentence3: I will travel in Sunday. Sentence4: We have many to choose from, is there a certain area you'd like to be in? Sentence5: Pembroke college will blow your mind, free adminssion located at trumpington street, postal cb21rf, phone 01223338100. Are there any other questions today? Sentence6: I appreciate your help. I am also interested in looking at a college while I am in Cambridge. Could you help me? Sentence7: I apologize, TR5009 is available. It is a 28 minute train ride, leaving Cambridge at 18:40, arriving at Stansted Airport by 19:08. Your reference number is 090MN9HI . Sentence8: I need a train for stansted airport and I need to arrive by 19:30 please. Sentence9: I want to leave from Cambridge. Sentence10: You're welcome, let me know if I can assist with anything else. Sentence11: There is no longer a TR5009 but have booked you for the next best. The price is 8.08 GBP Sentence12: Okay. Where will you be leaving from please? Sentence13: Actually, can you tell me the travel time for that? Sentence14: ok the TR5009 arrives at 19:08. Sentence15: Yes can you book that for me please? Sentence16: certainly, how many tickets do you need? Sentence17: What day will you be traveling on? Sentence18: No particular area, would you choose one for me? Question: Who has spoken the sentence 17? (A) User (B) System
Output:
Answer: (B) System