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: I am looking to go to cambridge on tuesday Sentence2: Glad I could be of assistance. Sentence3: Which day are you looking to travel? Sentence4: Thank you very much for your help! Sentence5: I am looking for a train leaving from Norwich. Sentence6: I would like to leave after 09:45 Sentence7: Okay, I have 14 trains on that route leaving hourly on the :16 from 10:16 to 23:16. TR0667 leaves at 10:16, arrives at 11:35, with a total duration of 79 minutes. Sentence8: Yes, a train leaves at 11:16 with the ID TR0839. Sentence9: Ok, do you have one that leaves at 11:16? Can you provide me with the train id for that one? Sentence10: Sure. What time are you looking to leave? Question: Who has spoken the sentence 1? (A) User (B) System
Output:
Answer: (B) System