Q: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Sentence1: Okay, we've got christ's college on saint andrew's street at 01223334900. Will there be anything else? Sentence2: While in Cambridge I am looking for a college in the centre of town please. Sentence3: No, that will be all. Thank you! Sentence4: Yes. I would like the train to depart from Cambridge and arrive by 18:15. Sentence5: I'm sorry, but I don't understand. Can you please restate your request? Sentence6: You're quite welcome! We hope you've found this service useful and wish you a wonderful rest of your day. Sentence7: Yes, I need a train from cambridge to bishops stortford on Tuesday. I need to arrive by 18:15. Sentence8: Yes, I can help you with that. The first train leaves at 05:00 on Friday and the last one departs at 13:00, do you have a preference? Sentence9: No I don't have a preference. Sentence10: saint andrew street Sentence11: Thank you. TR2153 will depart cambridge at 17:29 on tuesday, arriving at bishops stortford at 18:07. Will that work? Sentence12: There are 13 colleges in the centre of town, did you have a particular one you were interested in? Sentence13: I am also looking for a train that departs from cambridge. I'd like it to arrive by 18:15. Sentence14: What would your destination be? Sentence15: Can I get tickets for 5 people? Sentence16: Sure. Your reference number is KOPBB0EL . Anything else I can do for you today? Sentence17: That should work thank you very much Sentence18: How many tickets do you need? Question: Who has spoken the sentence 16? (A) User (B) System
A:
Answer: (A) User