Given the task definition and input, reply with output. You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: On Tuesday there is a train from Stevenage to Cambridge at 10:45 Sentence2: Can you help get tickets for a train on Tuesday? Sentence3: Absolutely! Where will you be heading? Sentence4: I need to go to Cambridge from Stevenage after 10:45. Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System