Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: I have it booked the reference number is IYHXK218 and the price is 42.96 GBP. Sentence2: okay, where are you departing from? Sentence3: Great, thanks for your help. Sentence4: Train TR8736 leaves at 5:01 and arrives at 6:01. Sentence5: I'm trying to get to Broxbourne. Sentence6: Perfect. please book it for 3 people. Sentence7: I am departing from Cambridge. Sentence8: Where are you heading to from Cambridge? Sentence9: I am looking for a train. The train should arrive by 21:00 and should leave on sunday Sentence10: Absolutely, have a great day! Question: Who has spoken the sentence 4? (A) User (B) System
Output:
Answer: (A) User