You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Example: Sentence1:i need a place to dine in the center thats expensive Sentence2: I have several options for you; do you prefer African, Asian, or British food? Sentence3: Any sort of food would be fine, as long as it is a bit expensive. Could I get the phone number for your recommendation?Question: Who has spoken the sentence 2? (A) User (B) System
Example solution: Answer: (A) User
Example explanation: The sentence 1 is said by a user because the intent of it says that the information has to be gathered from the system

Problem: Sentence1: Thank you very much. That is all I need. Bye. Sentence2: Ok. You are booked for 5 seats on TR5874. Wednesday at 09:59. The total is 83 GBP payable at the station. Your Reference number is 8C6ZLYNK . Sentence3: I'd be happy to. Assuming you're departing from Cambridge, what day and time would you like to travel? Sentence4: I'd be happy to reserve your room. How many nights would you like to stay, and how many in your party? And do you need any other information about the location? Sentence5: Yes, I'd like five tickets, please. Sentence6: I am, it is a guesthouse in the north. Would you like to make a reservation? Sentence7: I need to depart on Wednesday. I'll need to arrive by 1245. Sentence8: I have a train leaving cambridge at 9:59 and arriving at london liverpool street at 11:27. Would you like me to book that for you? Sentence9: Thank you for using Cambridge TownInfo centre. Please remember us for all of your future travel needs. Sentence10: Hi, are you familiar with the Avalon hotel? Sentence11: I would love that. Can you book me a room starting on Friday night? Sentence12: I need a train that stops at london liverpool street and should arrive by 12:45, will you book it for me Question: Who has spoken the sentence 4? (A) User (B) System
Solution: Answer: (A) User