Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: There are 7 people in my party and we'd like to leave after 16:15 on Tuesday. I'll need a reference number, please. Sentence2: Thank you so much. We also need a cheap place to stay. Can you help with that? Sentence3: I've got 133 scheduled between Cambridge and Norwich. What day of the week are you planning to travel? Sentence4: Is there a part of the city you would like to stay in? Sentence5: I'm looking for a train going to norwhich from cambridge. Sentence6: We have quite a few results. Is there a specific time you'd like to leave or arrive by? Sentence7: Alright, the booking was successful, the total fee is 123.2 GBP payable at the station . Reference number is: KFMNIOGF . Sentence8: I would like to leave on Tuesday. Question: Who has spoken the sentence 4? (A) User (B) System
Output:
Answer: (A) User