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 need that for 3 people please. Sentence2: My pleasure. Thank you. Sentence3: I need a train leaving from Cambridge. Sentence4: Absolutely, what day of departure and what destination location? Sentence5: Thanks, that's all I need. Have a nice day. Sentence6: I have booked your tickets. 70.8 GBP is payable at the station. The reference number is JLCUPIN6 Sentence7: I am heading to London Kings Cross and would need the train for Wednesday please. Oh and I need to leave after 18:00 sometime. Sentence8: Okay, the TR8676 train leaves at 19:00 and arrives at 19:51. Would you like to purchase tickets? Question: Who has spoken the sentence 5? (A) User (B) System
Output:
Answer: (B) System