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: I need a 4 star place that has free wifi. Sentence2: Any particular area you would like to stay? Sentence3: Would you like to try allenbell? Sentence4: No thanks. Go ahead and book the train for 4 people and please provide the reference number. Sentence5: I don't really have a preference. Sentence6: i dont mind either. Sentence7: Thank you that is all I needed. Sentence8: Leaving Cambridge this coming Sunday. Sentence9: I'm sorry, we don't have any trains arriving by 17:15. The earliest train will arrive at london kings cross at 19:51. Do you need anything else? Sentence10: I have 21 trains that match your request. Where will you be departing from? Sentence11: Okay! What price range would you like? Sentence12: We have seven places, any preference on price or rating? Sentence13: You're welcome. Have a great day! Sentence14: Ok. We've narrowed to 6 options. Do you want parking? Sentence15: I need to find a train going to londons kings cross that would arrive by 17:15 Sentence16: Thank you. I also need to find a place to stay. Sentence17: I have made those reservations and the reference number is I4K0OYPF . Sentence18: In the East part of town, please. I need free WiFi. Sentence19: No parking is not a concern of mine. Sentence20: Your booking was successful, the total fee is 75.52 GBP payable at the station . Your reference number is : UMS71SR7 . Your train will leave at 19:00. Sentence21: Okay! Would you like to stay in a hotel, or in a guesthouse? Sentence22: Yes, please book me for 4 people, for 5 night starting on Tuesday. Question: Who has spoken the sentence 15? (A) User (B) System
Solution:
Answer: (B) System