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: That is all I need, thank you! Sentence2: Where will you leave from? Sentence3: I'm leaving from birmingham new street train station. Sentence4: Booking completed! Booked car type : red lexus Contact number : 07427709999 Sentence5: I need a 04:00 taxi at the Cambridge Lodge Restaurant. Sentence6: You're quite welcome. Thanks so much for using the Cambridge TownInfo Centre. Have a great day! Goodbye. Question: Who has spoken the sentence 4? (A) User (B) System
Solution:
Answer: (A) User