You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Milton Country Park is a great place to visit! It's in the North and free to enter. Sentence2: How about TR4803 that leaves at 09:29? Sentence3: Great! Please, give me the address of the park. Sentence4: I have 5 to choose from. Is there a certain area you were wanting the park to be in? Sentence5: milton country park, milton. Sentence6: I want to leave on Sunday. Sentence7: There are 56 trains traveling from Bishops Stortford to Cambridge after 9:00 between Friday and Wednesday. What day to you want to travel? Sentence8: Of course. How many tickets do you need? Sentence9: Actually, I don't need a booking. I just need to know when it arrives, thanks. Sentence10: no specific area. just recommend one. Sentence11: Thank you. I am also looking for a park to go to. Sentence12: That will work can you book that for me please? Sentence13: Thank you so much for your time. Have a nice day! Sentence14: You too, enjoy your stay! Sentence15: I need to take a train from bishops stortford to Cambridge. Ill need to leave after 9:00 Sentence16: It arrives at 10:07. Question: Who has spoken the sentence 15? (A) User (B) System
Output:
Answer: (B) System