Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: They both have free parking. I'd recommend the University Arms Hotel in the centre. Can I book this for you? Sentence2: Unfortunately, I don't have any matches in my system. Is there something else I can look for? Sentence3: How about one in the cheap price range? Sentence4: There are several guesthouses in the cheap range all over town. What area do you prefer? Sentence5: Hello, can you give me some information on a train? Sentence6: Yes, I need a 4 star hotel in the expensive price range. Sentence7: Okay, there are several departure times that fit what you're looking for. The earliest is 5:16. Would you like me to book that for you? Sentence8: I plan to go to Cambridge and will be departing from norwich on Saturday and plan to ride a train that should arrive cambridge by 16:00. Sentence9: Train id is TR2602, travel time is 79 minutes and the price is 14.08 pounds. Is there anything else you need? Sentence10: I absolutely can. Where are you looking to go? Sentence11: Can you give me the travel time, departure time and train id for the one arriving closest to 16:00 please? Sentence12: It needs to have free parking. Sentence13: I'm sorry, I actually need a guesthouse. Sentence14: We have huntingdon marriott hotel in the west and university arms hotel in the centre, any preference? Question: Who has spoken the sentence 6? (A) User (B) System

Answer: (A) User