You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be your helping hand?

USER: I am Edwards White, I want to book a direct flight to Washington to visit  Tudor Place with my friend. Can you book a flight under fare of 200?

ASSISTANT: Sure, may I know your travelling dates?

USER: I will fly on 01/27 and return on 01/29.

ASSISTANT: Can I know your Journey codes?

USER: My source point is NY-LGA and destination is DC-IAD.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: There is no flight found with your requirements.

USER: Ok, thank you for the information.

ASSISTANT: Thanks for availing us.