Detailed Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Okay, I have you booked on TR1549 from Cambridge to Ely leaving Wednesday at 17:50, arriving 17 minutes later at 18:07. The reference number is RHE56NAC . Anything else today? Sentence2: I believe I am good for the moment thank you for your help. Sentence3: You're welcome! Have a safe trip! Goodbye. Sentence4: I would like to go to Ely, from Cambridge. Sentence5: Yes. One ticket. I need the travel time and train ID. Sentence6: I found TR8610 leaving at 17:35 would that work for you? Sentence7: Where will you be leaving from and traveling to? Sentence8: I need a train on Wednesday that leaves after 16:00. Question: Who has spoken the sentence 5? (A) User (B) System
A:
Answer: (B) System