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 please bookm it for me and I need the departure time. Sentence2: Certainly. Did you have a destination in mind? Sentence3: That sounds great! What is their address? Sentence4: You are welcome. Please let us know if you ever need assistance with anything else. Sentence5: Yes London Kings Cross. Sentence6: Great. Now what time would you like to leave by or arrive by? Sentence7: Arrive by 10:30 in London Kings Cross. Sentence8: How many tickets do you need? Sentence9: Just one please Sentence10: Thank you! That will be all. Sentence11: TR8636 will arrive by 09:51, would that work for you? Sentence12: OK perfect, I have that booked for you then, is there anything else I can help you with? Sentence13: It is located on herschel road and the phone number is 01223332360 Sentence14: I also need a college to go to in the west. Sentence15: Hi, I'd like a train leaving from Cambridge on Thursday, please. Sentence16: I have 5 different options for you. Might I suggest Clare Hall. It has free admission and it is a great campus to tour. Question: Who has spoken the sentence 11? (A) User (B) System
Solution:
Answer: (B) System