You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Let me give you an 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
The answer to this example can be: Answer: (A) User
Here is 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

OK. solve this:
Sentence1: There is a train that leaves at 15:35. Sentence2: Just to be clear, you want me to book 1 seat on train TR4389, departing Ely at 15:35. Is that correct? Sentence3: Ok I will book that for you and get you a confirmation number Sentence4: What day would you like to travel? Sentence5: The first train leaves at 05:35 and has a duration of 17 minutes. Trains leave every two hours thereafter ending at 23:35. Sentence6: No. I don't need a booking. Sorry. I do need help finding an attraction. Sentence7: I am traveling friday. Sentence8: There are several attractions what part of town Sentence9: Do you have one leaving after 15:30? Sentence10: Need the train schedule from ely to cambridge Question: Who has spoken the sentence 5? (A) User (B) System
Answer:
Answer: (B) System