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 am also looking to book a train. I will be departing on Kings Cross station in London this Friday. Sentence2: Okay great, your booking was successful and your reference number is : 6KJK9QY1 . Sentence3: The Fitzwilliam museum in the centre may be a good choice, thank you. Sentence4: It doesn't matter when I arrive, but I would like to book for 8 people. Sentence5: What time would you like to arrive by? Sentence6: Could I have the post code and phone number for that one please? Sentence7: What is your destination and time preference? Sentence8: Glad we could be of help, have a nice trip! Sentence9: I'd like to go cambridge and leave after 15:15. Sentence10: That's all I needed, thank you! Sentence11: I would like to find a museum to visit while in Cambridge. Sentence12: Sure thing! The address is Trumpington Street and the phone number is 01223332900. Can I help you with anything more? Question: Who has spoken the sentence 5? (A) User (B) System
Output:
Answer: (B) System