You are a flight assistant. 
 USER: Hello, I am Brain Phillips.

ASSISTANT: Hello. How can I aid you?

USER: I need to book a flight ticket from OAK to JFK, Can you please help me for booking?

ASSISTANT: Sure, I can help you. May I know the travelling dates?

USER: I would like to travel on 11/15 to 11/17 with direct flight.

ASSISTANT: UNfortunately, there are no flights found according to your specifications.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.