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, goodbye. Sentence2: I'm looking for a train on Thursday that need to arrive by 19:15. I'll be leaving Cambridge and heading to Kings Lynn. Can you help? Sentence3: Booking was successful, the total fee is 68.6 GBP payable at the station . Reference number is : 7E54PFPZ . Sentence4: All right then. Thanks so much for calling. If you think of anything else, please don't hesitate to call us back. Sentence5: I'm also looking for a recommended attraction in the centre. I don't care what type it is. Sentence6: I am planning a trip in Cambridge. Sentence7: I can help you with travel, restaurants, attractions and places to stay. Sentence8: the latest a train reaches your station is 05:58. can i book it for you? Sentence9: Yes, please. I need tickets for 7 people. Sentence10: There's Holy Trinity Church on market street in the centre, the architecture is amazing and entrance is free. Is there anything else you'd like to know about it? Sentence11: I only needed the train. Sentence12: enjoy your stay in cambridge Question: Who has spoken the sentence 1? (A) User (B) System
Output:
Answer: (B) System