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: Okay great! Glad I could help. Sentence2: I have 19 trains going from Cambridge to Leicester on Thursday. What time would you like to arrive by? Sentence3: I also need a place to stay in the north area. Sentence4: There are no trains that leave after 12:15. Sentence5: I was able to book you a room for 2 at city centre north b and b, the reference number is 57F4S22N . Do you need any more assistance? Sentence6: No, that's all I need for right now. Thanks for the assistance! Sentence7: It don't matter as long as it is cheap. I need it for 6 people for 2 nights starting tuesday Sentence8: Okay, do you have any other suggestions? Sentence9: I will be traveling on thursday. Sentence10: I believe that the TR0822 leaving 12:15 would be great for you. Should I make a booking for you? Sentence11: I would love to leave after 12:15 please. Sentence12: Please assist me in finding a train going to leicester from cambridge. Sentence13: Would you like a guesthouse or a hotel? Sentence14: Okay. What day would you like to travel? Question: Who has spoken the sentence 7? (A) User (B) System
Solution:
Answer: (B) System