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'll be flying out of the country from stansted airport on Tuesday. I need to get there at least by 13:30 Sentence2: Thank you so much, that's all. Goodbye. Sentence3: I am actually looking for a train to Stansted Airport. Sentence4: Your reference number is 9IQ2K2DW . Sentence5: Friday, 4 nights. Reference number please. Sentence6: Thank you for using the Cambridge TownInfo centre, and enjoy your time in Cambridge! Sentence7: TR7293 will arrive there at 12:08. Sentence8: i am looking for information in Cambridge. Sentence9: On what day would you like to arrive? Sentence10: There's the allenbell, that's located in the east side of town at 517a coldham lane. Sentence11: Great. I also need a place to stay that is a cheap guesthouse. Sentence12: Can you please tell me where you will be departing from and what time and day? Sentence13: Please reserve a room for 1. Sentence14: What area are you wanting to stay? Question: Who has spoken the sentence 7? (A) User (B) System
Output:
Answer: (B) System