You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Let me give you an example: 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
The answer to this example can be: Answer: (A) User
Here is 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

OK. solve this:
Sentence1: I'd be happy to help with your request. What day will you be travelling and what is your destination? Sentence2: I am looking for a train. Sentence3: I'll be heading to peterborough on thursday Sentence4: You're very welcome! Make sure to let us know if you'd like to book anything! Sentence5: Thank you for your help Sentence6: these are the available options trainID departure destination day leaveAt arriveBy price duration book (optional) TR7098 cambridge peterborough thursday 05:06 05:56 16.50 pounds 50 minutes TR4745 cambridge peterborough thursday 05:34 06:24 16.50 pounds 50 minutes TR9932 cambridge peterborough thursday 06:06 06:56 16.50 pounds 50 minutes TR8769 cambridge peterborough thursday 06:34 07:24 16.50 pounds 50 minutes TR6688 cambridge peterborough thursday 07:06 07:56 16.50 pounds 50 minutes Question: Who has spoken the sentence 5? (A) User (B) System
Answer:
Answer: (B) System