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: I think I would be interested in the 17:54 and I need to book it for 8 people. Sentence2: Okay TR2442 is booked for 8 people at 17:54 on saturday. It will cost 81.92 GBP in total, and your reference number is CCTYHUU8 . Sentence3: What is your departure site and destination? Sentence4: After 17:30 please Sentence5: The train should go to Cambridge and should depart from Stevens. Once you find the train you want to make a booking for 8 people. Sentence6: Just to clarify, you want to leave after 05:30 (am), or 17:30 (5:30 pm)? Sentence7: Have a good visit. Sentence8: Table for 8 at Gourmet Burger Kitchen, arriving at 20:30. They can hold your table for up to 15 minutes, only. Your Reference number is : ACOVVEZM . Sentence9: Thank you, that is all I needed. Sentence10: There are 4 trains that meet your specifications. They run every two hours. The first one leaves at 17:54 and the last at 23:54. What would you prefer? Sentence11: I need a train leaving on Saturday after 5:30 pm Sentence12: I'm also looking for a restaurant that serves north american food, in the expensive range. Sentence13: There is a train that leaves at 17:54. Sentence14: I am departing from stevenage and going to cambridge. Sentence15: gourmet burger kitchen is perfect for you. It is in the center and is in expensive price range. Could you like a reservation? Sentence16: Yes. That would be great. Make it for Saturday for 8 people at 20:30. Question: Who has spoken the sentence 6? (A) User (B) System
Answer:
Answer: (A) User