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: Thank you, have a great visit, goodbye! Sentence2: Yes, book please and I need travel tome and price Sentence3: I have many trains available on Tuesday. Do you have a time preference? Sentence4: I only need one ticket today. Sentence5: No, thank you for your help Sentence6: How many tickets would you like me to book? Sentence7: The TR 4631 arrives by 19:23. Would you like to book this one? Sentence8: Your booking was successful, the total fee is 75.09 GBP payable at the station. Your Reference number is ZCR9P2WW . Can I assist you with anything else today? Sentence9: I'd like to take the train to cambridge from birmingham new street on tuesday, can you help me with that? Sentence10: Yes, I'd like to arrive by 19:30, please. Question: Who has spoken the sentence 8? (A) User (B) System
Answer:
Answer: (A) User