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: ok thanks and have a great day Sentence2: Oh, ok. I really don't want to stay at a guesthouse though. Can you recommend a hotel instead? Sentence3: alexander bed and breakfast is a guest house in the centre area. Would you like to book a room? Sentence4: Keep the snarky comments to yourself. Sentence5: What is the train schedule from birmingham new street like? I need to arrive at 13:45. Sentence6: It doesn't matter. What do you recommend? Sentence7: I need the travel day to be Sunday. I'll be going to Cambridge and arrive by 13:45. I'll be leaving from Birmingham New street. Sentence8: What is the travel time on that train? Sentence9: I am planning a vacation and really could use some help finding a good place to stay in town. I've never been to Cambridge before. Sentence10: Booking was successful. Reference number is : 36N9VCAD . Is there anything else I can help with? Sentence11: which side of town do you prefer and what is the price range? Sentence12: Yes, thanks very much! Have a great day! Sentence13: You too! Thanks so much for all the help. Please end the convo and read the directions next time. thanks Sentence14: Train TR7468 will arrive at 13:23. Will this work for you? Sentence15: You are quite welcome, thank you for using our services. Have we met all of your needs today? Sentence16: Where would you like the train to arrive, and what time will you be leaving? Sentence17: The Huntingdon Marriott hotel is a very nice place. Sentence18: It is 163 minutes on that train. Sentence19: Sounds good. Can you get me a room for 2 for 5 nights starting Sunday? Sentence20: Excellent. Thanks for all the help! Question: Who has spoken the sentence 15? (A) User (B) System
A:
Answer: (B) System