Given the task definition, example input & output, solve the new input case.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
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
Output: Answer: (A) User
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 case for you: Sentence1: I just need to leave after 18:45. Sentence2: I would like to book a train for Tuesday at 18:45 departing at bishops stortford and arrive at Cambridge. Sentence3: What time would you like to arrive by? Sentence4: No, thank you for your help. Sentence5: Hi..A reservation for 4 people has been confirmed. The reference number is 30MCMOEX and the price is 40.4GBP payable at the station. Anything else I can do? Sentence6: The TR9286 train goes from bishops stortford to cambridge on Tuesday at 19:29, Shall I book that for one person? Sentence7: Can you please book it for 4 people? Sentence8: you are welcome! Have a good day! Question: Who has spoken the sentence 6? (A) User (B) System
Output:
Answer: (A) User