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: Your table has been booked. Your reference number is LPQVDDE9 . Sentence2: Yes, please. I need to book 3 nights starting on Friday for 5 people. Sentence3: I am glad I could help you with lodging and dining from the Cambridge TownInfo centre. Good bye. Sentence4: Yes, please. I need reservations for 12:30 on Friday. There are 5 in my group. Sentence5: surprise me what is the best choice ? Sentence6: Saigon city is Asian oriental and is in the north as the hotel is. It is expensive. Shall I book it for you? Sentence7: I don't care about the price. Sentence8: Hi, I am looking for a nice hotel to stay in. I would like it to include free parking. Internet access is not necessary. Sentence9: acorn guest house is a 4 star hotel located north of cambridge would you like to reserve? Sentence10: i have many. will you please state the price? Sentence11: Yes, please give me reference number. Sentence12: That is all. Thank you. Sentence13: Will you be needing a reference number? Sentence14: Do they have internet? Sentence15: What food type are you interested in? Sentence16: Yes it does. Shall I book it? Sentence17: I'd also like a recommendation for a restaurant in the same area as the hotel. Sentence18: Booking was successful. Reference number is : 7OLQYP67 . What else can I assist you with today? Question: Who has spoken the sentence 15? (A) User (B) System
Answer:
Answer: (B) System