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: I need a train ticket from cambridge to ely. I want to arrive at least by 21:15, can I get the reference # too please? Sentence2: Yes, for myself and 4 nights starting tuesday Sentence3: The price does not matter. Sentence4: Okay! How many people would you like me to book a train for? Sentence5: arrive by 21:15 for the same group of people. and I need a reference number Sentence6: Would you like me to book it for you? Sentence7: yes please. Can I get the reference number? Sentence8: I have booked you on the train leaving Cambridge at 19:50. Your will arrive at 20:07 and your reference number is 7776W8DF . Sentence9: I recommend the Warkworth House at Warkworth Terrace. Would you like me to book this for you? Sentence10: There are 8 trains that would get you there by 21:15. What time would you like to depart Cambridge? Sentence11: What day would you be traveling? Sentence12: Can I look up anything else for you today? Sentence13: Yes it has free wifi. Would you like me to book it for you? Sentence14: Hi. Can you help me find an east hotel? Sentence15: Sure, did you need anything else specifically? Sentence16: Thank you so much for your help. Sentence17: I will be traveling on tuesday. Sentence18: No, it does not matter. I am also looking a for place with free parking. Sentence19: That is all for now. Thank you for all your help. Sentence20: We have six four star guesthouses on the east side. Does price matter? Sentence21: You are all set, the reference number is ZI27S8E2, any further questions? Sentence22: I would like something with 4 or 5 stars. Sentence23: All have free parking! Moderately or cheaply priced? Sentence24: Does it also have free wifi? I need wifi too. Sentence25: Thank you for contacting us and have a nice day. Sentence26: I do not have a specific time to leave, thank you for asking. Question: Who has spoken the sentence 12? (A) User (B) System
Solution:
Answer: (A) User