You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Example input: 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
Example output: Answer: (A) User
Example explanation: The sentence 1 is said by a user because the intent of it says that the information has to be gathered from the system
Q: Sentence1: Graffiti is in the west area. Would you like me to see what is available in the east area? Sentence2: yes, I would prefer it to be in the west area. Sentence3: Okay. There is one option here for you. It is grafton hotel restaurant. Do you need a reservation? Sentence4: I need more information, such as when you would like to book it and for how many people? Sentence5: I would also like to get some expensive fusion food. Sentence6: What area would you like that in? Sentence7: Graffiti serves British food in the west area, are you ready to make a reservation? Sentence8: I am looking for a place to stay with free wifi. Sentence9: I need a restaurant in the east area, so that won't work. Sentence10: Yes please. Go ahead and book it for me. Thank you and good bye Sentence11: In the east side of town. Sentence12: How about a British restaurant instead? Sentence13: How about travellers rest restaurant located in the west side of town? Sentence14: We have 7 options that meet your criteria. Do you have a specific price range in mind or would you like a recommendation? Sentence15: The address is 138 perne road Sentence16: Not really, but can you give me the address for your favorite place? Sentence17: Is Graffiti in the same area as my hotel? I'd like to keep it to that area if possible. Sentence18: I prefer the Carolina Bed and Breakfast. It's a 4 star guesthouse in the moderate price range. Would you like for me to book a room for you? Sentence19: I'm sorry, I was confused. I need a british restaurant in the east side. Sounds like Graffiti won't work for me. Sentence20: There is nothing that meets that criteria, shall I run another search? Sentence21: Possibly, but first can you give me the exact address for Graffiti? Sentence22: Could you just give me the address for now? Sentence23: There are 6 to choose from. Do you have a preference for area? If not, then I recommend graffiti. Sentence24: Sure they are located at Hotel Felix Whitehouse Lane Huntington Road, is there anything else I can help you with? Question: Who has spoken the sentence 15? (A) User (B) System
A:
Answer: (B) System