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 they have. Thank you! Sentence2: I have booked your train. 10.1 GBP is payable at the station and the reference number is VPHSFWC9 . Is there anything else I can help you with? Sentence3: What is your destination? Sentence4: I am looking for a train. Sentence5: I am heading to the Stansted Airport, just myself, and I need to leave after 17:00. Go ahead and book it and give me the reference number. Sentence6: I need to leave on Thursday from Cambridge. Sentence7: Thank you for using our service. Have all of your needs been met? Sentence8: It has been my pleasure! Don't hesitate to contact us again if you require any additional assistance. Sentence9: Sure thing. Could you tell me where you're departing from, where you're arriving, and when you'd like to travel by train? Sentence10: No, thank you. That is all I need. Question: Who has spoken the sentence 4? (A) User (B) System
Solution:
Answer: (A) User