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: I need to come to Cambridge on Sunday and I'd like to take a train. Do you have anything leaving out of Birmingham New Street on that day? Sentence2: I want to book it for 5 people for 2 nights starting on the same day as my train trip. Sentence3: There is one train that arrives by 08:23. Do you want me to book it? Sentence4: Thank you for contacting us and have a nice day. Sentence5: The train id for that is TR8730 and the price is 60.08 pounds per ticket. Can I help you more today? Sentence6: Thank you. That was all I needed today. Sentence7: I would like to arrive in Cambridge by 9:15 please. Sentence8: Have a great trip. Sentence9: The trip is close to 3 hours. Do you have a preferred departure time? Sentence10: What would you like to know about it? Sentence11: I am also looking for information on a hotel called autumn house. Sentence12: Thanks a lot for all your help! Sentence13: Can I get the train ID and also the price for this trip? Sentence14: booking successful. Ref number is X0JLKVVF . Anything else today? Question: Who has spoken the sentence 7? (A) User (B) System
Solution:
Answer: (B) System