You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: thank you. Is there anything else? Sentence2: The price per ticket is 60.08 pounds, how many travelers will be requiring tickets? Sentence3: You're very welcome. Please contact us again, if we can be of further assistance. Sentence4: jesus green outdoor pool is located between victoria road and the river, cb43px. Phone number is 01223302579. I'm afraid I don't have an entrance fee listed though. Sentence5: Train TR0686 will arrive at Birmingham New Street at 14:44. Sentence6: I need to leave after 11:15 on Sunday. Sentence7: Okay what is the price per ticket? Sentence8: Please let me know what time you would like to arrive or when you would like to depart. Sentence9: Not yet. What time will that arrive in Birmingham? Sentence10: which one would you like jesus green outdoor pool or kings hedges learner pool? Sentence11: No, that is all the help I need for today. Thanks again! Sentence12: Yes please. I'll also need the entrance fee, post code and address. Sentence13: No tickets yet. But I do need info on a swimming pool in the north. I you could recommend one? Sentence14: Train TR0686 will work for you. Would you like me to book you passage? Sentence15: The outdoor pool please. Sentence16: That's okay. That will be it. Thanks for all your help! Sentence17: I'm looking for a train departing from cambridge going to birmingham new street. Sentence18: Okay I have two to choose from. Would you like me to recommend one to you? Question: Who has spoken the sentence 16? (A) User (B) System
Answer: (A) User