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: Great! Would you like to book a train to take you there? Sentence2: am going to stansted airport Sentence3: That's good. Book me in for 3 people and 4 nights starting Tuesday. Sentence4: Saturday, please. I will need the departure time, train ID, and price. Sentence5: Ok. Where do you need the taxi to pick you up at? Sentence6: Okay. Glad I could help. Have a great trip. Goodbye. Sentence7: I have you booked at the Hobsons House starting Tuesday for 4 days for three people. Your reference number is P4RWFGM2 . May I help you with anything else? Sentence8: I need to arrive at the airport by 14:45 on Saturday. Sentence9: Okay, what time would you like to leave? Sentence10: There are 9 results. Is there a certain time you'd like to leave by? We can narrow the results down that way. Sentence11: Can I be of any further assistance? Sentence12: What do you need to know about the Hobsons House guesthouse? Sentence13: Yes, I need a taxi please. Sentence14: i am planning a trip in cambridge Sentence15: I will bee a hotel called hobsons house. Sentence16: I think this train might work well for you. TR6193 leaves at 13:40 and gets in at 14:08. It costs 14.08 pounds. Can I book this? Sentence17: You are very welcome. Is there anything else I can help you with? Sentence18: No, that's all I need today. Thank you. Good-bye. Sentence19: Not right now. Thanks for all your help though. Sentence20: Nevermind. I will not need the taxi after all. Thank you for all your help. Please book a seat on TR6193 for me. Sentence21: thank you for your help today ! Sentence22: Where would you like to go? Sentence23: I would just like some general information before I book, what area is it in? Sentence24: i'm also looking for a train leaving from cambridge. Sentence25: It's located in the west. Would you like more information? Sentence26: Your train is booked for Sat your fee is 24.24 GBP and payable at station. Your ref. number is HGQGS7MX Question: Who has spoken the sentence 1? (A) User (B) System
Solution:
Answer: (B) System