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 have confirmed your taxi departing from allenbell at 21:15 to shanghai family restaurant. The contact number is 07779063338. Is there anything else we can help you with? Sentence2: Do you have a preference for the hotel's area or price range? Sentence3: The area doesn't really matter, but I would like something cheap. Sentence4: Hello I'm looking for the shanghai family restaurant. Sentence5: You're welcome. Good-bye. Sentence6: What is your destination? Sentence7: I have both the Autumn House and the Allenbell. They are both guesthouses on the east side of town with a 4 star rating. Should i book one for you? Sentence8: The booked Car type is a Red Toyota. Sentence9: I don't have a particular destination for my taxi. Sentence10: I'm sorry, but I cannot provide you information on the taxi without knowing your destination. Sentence11: The postcode is cb11dg. Sentence12: I need to get from the allenbell hotel to the shanghai family restaurant, please. Sentence13: Yes I would like to stay on the east side of town. Sentence14: Yes, I also need the car type. Thank You Sentence15: I have at least 8 hotels that might suit you. They all have internet, a 4 star rating and are in the cheap price range. Do you have a preference for what part of town you stay in? Sentence16: Can you find me a 4 star hotel? Sentence17: I'm sorry, but I don't have any hotels that match that criteria. Would you like to change your requirements? Sentence18: I will als require a taxi. I need to leave the hotel by 21:15. Can you provide he contact number and the type of car please. Sentence19: The Allenbell is fine. Could you book a stay for 7 people, starting on Tuesday, for 4 nights? I also need a reference number. Sentence20: Great I am also looking for a hotel with a 2 star rating that has free parking. Sentence21: Can you tell me the postcode? Sentence22: Yes I got it, what can I do for you sir? Sentence23: Thank you so much for all of your help, have a great day! Sentence24: Booking was successful. Reference number is : AVPKTYBJ . Question: Who has spoken the sentence 15? (A) User (B) System
Answer:
Answer: (B) System