You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

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
Solution: Answer: (A) User
Why? The sentence 1 is said by a user because the intent of it says that the information has to be gathered from the system

New input: Sentence1: YEs its littlelamb5 . THanks Sentence2: Train TR2236 arrives by 17: 23, should I book that? Sentence3: Thanks for all your help today. I think that's it. Sentence4: How many people will be travelling? Sentence5: Booking was successful, the total fee is 300.39 GBP payable at the station. Sentence6: I need five tickets. Sentence7: No thank you, what time does the train leave Cambridge? Sentence8: I am planning a trip to Cambridge, looking for a place to dine. Sentence9: I need to leave Sunday from Cambridge and travel to Birmingham New Street, arriving before 17:45. Sentence10: Glad to have been of service. Thank you for using the Cambridge TownInfo centre. Have a great day. Sentence11: Great, thank you. Is there a confirmation number? Sentence12: How long is the journey between the two places? Sentence13: turkish is really good to me Sentence14: I prefer the moderately priced. Kindly book a table for 5 people for me for Saturday by 18:00. Sentence15: Thanks, I'm also looking for a train that leaves on sunday from birmingham new street. Sentence16: A table at Anatolia has been booked. The reference number is 4CKLSLAJ . Is there anything else I can do for you today? Sentence17: Sorry, there was an error earlier. The train you want is TR4905, leaving Cambridge at 15:01 and arriving Birmingham at 17:44. Sentence18: Yes, please make a booking. Sentence19: I can help with that. What type of cuisine are you interested in? Sentence20: The travel time is 163 minutes. Would you like to make a booking? Sentence21: What is the destination, time you want to leave and arrival time? Sentence22: We have three options available. Two are moderately priced while one is expensive. Do you have a preference? Question: Who has spoken the sentence 7? (A) User (B) System
Solution:
Answer: (B) System