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: The cost is 12.80 pounds for all trains leaving Cambridge to Stevenage on Friday. Would you like to book a seat? Sentence2: It should be in the west part of town. Sentence3: That is going to stevenage, correct? Sentence4: It is located on storey's way. There is no entrance fee! Do you need help with anything else? Sentence5: No thanks, I am all set. Sentence6: Thankyou, I am looking for a trian that leaves on friday. I am also wanting it to leave after 12:30. Sentence7: No it is going to london kings cross, do you need to go to stevenage? Sentence8: There are about 13 attractions in the west. I have several colleges, museums, and one entertainment attraction. Which would you prefer? Sentence9: I'm not picky, choose one for me! Sentence10: How about Churchill College? Does that sound interesting? Sentence11: The TR3685 leaves at 13:00. Need a ticket? Sentence12: Yes, I must go to Stevenage. How much is a ticket? Sentence13: That sounds great. Can you get me the address and the entrance fee? Sentence14: What kind of attraction are you interested in? Sentence15: First tell me about the attractions in town in the west. Sentence16: Happy to be of help. Goodbye. Question: Who has spoken the sentence 6? (A) User (B) System
Output:
Answer: (A) User