Q: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Sentence1: What is the cost per ticket? Sentence2: Certainly. Where are you departing from? Sentence3: Okay thank you very much. Sentence4: I am so sorry for the misunderstanding. I don't wish to book at the moment. I am all set. Have a great day. Bye. Sentence5: I'm sorry, I may have misunderstood. The train hasn't been booked yet, should I book it for you now? Sentence6: There are eleven trains that will get you there by then, for how many people? Sentence7: The price is $9.80 pound per ticket. Would you like to book it? Sentence8: We are happy to help. Can I assist you with anything else? Sentence9: I's sorry, I meant to say LEAVING from Cambridge on Tuesday, heading to King's Lynn. I need to arrive by 16:00. Sentence10: No, that's everything. Sentence11: How many people will need a ticket for the train? Sentence12: No problem. You have a great day also. Bye. Sentence13: No, that's all, thank you! Sentence14: I need some help finding a train. I'm going to Cambridge on Tuesday. Sentence15: Sure, go ahead. Thank you. Sentence16: Alright, you're booked. Anything else you need from me? Question: Who has spoken the sentence 1? (A) User (B) System
A:
Answer: (B) System