Q: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Sentence1: There are five european restaurants, which area would you like to dine in? Sentence2: Booking was successful. Your reference number is KANPYWAC, Sentence3: The area doesn't matter. Can you make a recommendation, please? Sentence4: Unfortunately Eraina is not available at that time. Would you like to try the City Stop Restaurant? Sentence5: How about 17:00? Sentence6: Thanks, that is all I need today. Sentence7: I would like to eat at an expensive european food restaurant Sentence8: The address for the restaurant is Cambridge City Football Club Milton Road Chesterton and the phone number is 01223363270. You will fond the restaurant in the North area of town. Sentence9: Sure, that would work. Sentence10: Great, Can you book me a table for 2 at 18:00 on Monday? Sentence11: Please book another day or time slot. the place could be full Sentence12: I would recommend Eraina, it is at Free School Lane City Centre. Question: Who has spoken the sentence 5? (A) User (B) System
A:
Answer: (B) System