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: You're welcome. Enjoy your visit. Sentence2: I am looking for an expensive hotel. Sentence3: I'm sorry our system doesn't offer that choice, would you like the phone number? Sentence4: I have found The Oak Bistro. It is located at 6 Lensfield Road. Sentence5: No that was it. Thank you so much. Sentence6: Ok, all booked, your reference number is M6OWA41B . Sentence7: I found 5 moderately priced British restaurants. Would you prefer the center or west part of town? Sentence8: Cityroomz is the only hotel that fits that description, would this work for you? Sentence9: Yes, that works. I'd like to book for 4 people for 5 nights, starting on Saturday, please. Sentence10: The restaurant should be in the centre. Sentence11: I am actually looking for a moderately priced hotel and I will need free wifi. Sentence12: Sounds good. Can you book it for 4 people at 14:30 on saturday? I'll need the reference number. Sentence13: No that's okay but I am looking for a hotel in the same area as the restaurant can you please help? Sentence14: The contact number is 07171167823 and it is a yellow ford. Is there anything else I can help you with today? Sentence15: I am looking for a moderately price British restaurant. Sentence16: One last thing. May I have their contact number and car type please? Sentence17: There are five hotels in the center of town that range from cheap to expensive. What kind of place are you looking for? Sentence18: Can you hold the reservation for 30 minutes instead? Sentence19: Thank you. I will also need a taxi to to from the hotel to the restaurant. Sentence20: I have booked the table for you; it will be reserved for 15 minutes. The reference number is WAU3QQKF . Sentence21: There are two expensive hotels in the centre of town. The Gonville and University Arms. Which would you prefer? Sentence22: Ok, I've booked you a taxi from your hotel to your restaurant. It will get you there before your reservation time. Question: Who has spoken the sentence 19? (A) User (B) System
Solution:
Answer: (B) System