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 leaving from London Liverpool Street on Monday. Are there any trains available? Sentence2: Wonderful! What can I do to help you plan? Sentence3: That would be great. What is the attraction type? Sentence4: Actually, I don't need for you to book it, but I do need some suggestions for places to go in the west part of town. Any type of attraction. Sentence5: No thank you. Can you provide me with the arrival time, price, and train ID? Sentence6: TR9202 costs 16.60 pounds per ticket and arrives by 17:07. Will that be all? Sentence7: Can you tell me how many people will be travelling? Sentence8: It is a museum, and admission is free. Can I help you with anything else? Sentence9: That's all I need, thanks so much for all of your help! Have a great day! Sentence10: yes, book it please. Sentence11: I would like to leave after 14:00 and go to cambridge. Sentence12: How about the cafe jello gallery? It is in the west and it's free. Sentence13: You are very welcome. Have a great day! Sentence14: We do have some trains, what time would you like to travel? Sentence15: TR9202 would be perfect for you. Shall i book it ? Sentence16: I am planning a trip in Cambridge. Question: Who has spoken the sentence 4? (A) User (B) System
Solution:
Answer: (A) User