You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

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: Answer: (A) User
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

New input: Sentence1: Absolutely. Anything else I can assist you with? Sentence2: I'm looking for lodgings on the east side, in the expensive price range. Sentence3: Can you make a reservation for Monday at 19:30 for 8 people? Sentence4: Yes, how many people and what day would you like to book? Sentence5: it doesn't need a free parking. Can you book a room for me? Sentence6: I just need to know the how many stars it has, the phone number there, and if they have WiFi. Sentence7: Unfortunately I can't get that booking for you. Is there anything else I can do for you? Sentence8: Yes, we have thanh binh on the West side. Would you like a reservation? Sentence9: Yes I will book it for you and get a reference number ? Sentence10: I am sorry for the delay. Also, there are no Venetian restaurants. Did you want a Vietnamese restaurant instead? Sentence11: I am also trying to find a Venetian restaurant. Are there any in town? Sentence12: Um I think you're getting ahead of yourself? I'm still waiting on that reference number for the booking you said you'd complete.... Sentence13: Is there anything else I may help you with today? Sentence14: The Express by Holiday Inn is located at 15-17 Norman Way int he Coldhams Business Park which is located in the east. Sentence15: Please book it for me. Sentence16: Sure, it has two stars, includes wifi, and the phone number is 01223866800. Can I help you with any thing else today? Sentence17: I do not need to book. Sentence18: Oh...alright...well I guess not then. You weren't very helpful but whatever bye Question: Who has spoken the sentence 15? (A) User (B) System
Solution:
Answer: (B) System