Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: Yes, I would also like the reference number for the booking please. Sentence2: Okay, how many tickets would you like? Sentence3: I'm heading to Broxbourne. Sentence4: TR2125 leaves at 09:01 and arrives at 10:01. Would you like me to book that for you? Sentence5: Yes there are. What is your destination? Sentence6: No, I think I'm all set. Thank you very much for your help! Sentence7: We have trains leaving hourly from Cambridge to Broxbourne, starting at 5:01 for 17.90 pounds. What time would you like to leave? Sentence8: Have a great day! Sentence9: I need that for 6 people. Sentence10: Are there any trains leaving from Cambridge on Thursday? Sentence11: You have 6 tickets on TR125 leaving Thursday at 9:01. Reference number is PPP9YI7K . 107.4 GBP will be payable at the station. Can I help you further? Sentence12: I am looking for one that will arrive by 15:00 Question: Who has spoken the sentence 4? (A) User (B) System
Output:
Answer: (A) User