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: How about 17:15? Sentence2: There is la margherita, an italian restaurant and thanh binh, a vietnamese restaurant. Sentence3: I wasn't able to make that reservation. Would you like to try a different time? Sentence4: Churchill college is on the west side on Storey's way. There is no entrance fee. The phone number is 01223336233. Anything else I can tell you? Sentence5: How many people will be dining, and for what date and time? Sentence6: I think that was it. Thank you for your help! Sentence7: You're welcome. Have a great day! Sentence8: Great. Can you also tell me about Churchill College? I am thinking of visiting that. Sentence9: That booking was successful. Your reference number is XF1JEIBG . Sentence10: Yes, I am interested in the one that serves Italian food. Sentence11: There will be 4 people and I would like to reserve it for Wednesday at 6:15. Sentence12: I am looking for a restaurant in West Cambridge, in the cheaper price range please. Question: Who has spoken the sentence 4? (A) User (B) System
Solution:
Answer: (A) User