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: I'll need to get some more information. Can you tell me your destination and when you will be travelling? Sentence2: I am leaving from Cambridge. Sentence3: Yes, on Thursday. Can you book me a train for 3 people please? Sentence4: I am going to bishops stortford at 12:45 on thursday. Sentence5: You would like to leave bishops stortford at 12:45? Sentence6: Sure! Where are you departing from and what is your destination? Sentence7: Okay the TR 2929 leaves at 11:29 and arrives at 12:07. Would you like me to book this? Sentence8: Can you help me book some train tickets? Question: Who has spoken the sentence 5? (A) User (B) System
A:
Answer: (B) System