You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
One 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
Solution is here: Answer: (A) User
Explanation: The sentence 1 is said by a user because the intent of it says that the information has to be gathered from the system

Now, solve this: Sentence1: Yes I need the reference number for the booking please. Sentence2: I can get you a train arriving at Cambridge at 12:07, how many tickets will you be needing? Sentence3: Just one, please. Sentence4: Yes that is MKL2A4KD . Is there anything else I can help you with today? Sentence5: I need a train to Cambridge. Sentence6: I'll be leaving from bishops stortford on saturday, and I need to get to cambridge at or a little before 14:00. Sentence7: No, that's all. Thank you very much for your help. Sentence8: I booked Train ID TR4594. Your price is 8.08 pounds. Is there anything else I can do for you? Sentence9: You are welcome. Have a nice day. Sentence10: Ok, when and where are you leaving from? Question: Who has spoken the sentence 9? (A) User (B) System
Solution:
Answer: (B) System