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: Thanks, that's all I need. Have a nice day. Sentence2: There is a train Saturday at 20:36. Does that work for you? Sentence3: Yes that works great can I book that for 5 people please? Sentence4: Sorry. I want to leave on Saturday after 20:30. Sentence5: I have confirmed booking for 5 tickets, your reference number is CID6UHHF . The total fee is 70.4 GBP payable at the station. Can I help with anything else? Sentence6: Great! I'm glad we could help. Sentence7: Certainly, there are many trains going that route. Can you specify which day you'd like to travel? Sentence8: Hello, I'm looking for a train from Cambridge to Norwich. Question: Who has spoken the sentence 6? (A) User (B) System
Solution:
Answer: (A) User