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 am looking for a train. The train should go to ely and should depart from Cambridge. Sentence2: I just need to leave after 9:00. Can you book for 7 people? Sentence3: That's all for today. Thanks for your help! Sentence4: You are all booked for 7 people on TR1159 leaving at 9:50 and arriving by 10:07. Reference #433N59V4 . Fee is 24.64 payable at the station. Anything else? Sentence5: I would like to leave after 09:00 on Sunday. Sentence6: Your welcome. Please let me know if you need anything else. Sentence7: Of course, what day would you like to travel? Sentence8: There are many departure times available. Did you have a specific time in mind? Question: Who has spoken the sentence 7? (A) User (B) System
A:
Answer: (B) System