You are a flight assistant. 
 USER: Hello, I am Ryan Perez.

ASSISTANT: Hello Ryan Perez, how may I assist you?

USER: I am planning to visit Central Park which is at New York EWR. Can you help me with booking under fare of 500?

ASSISTANT: Sure, can you provide me with the Genesis airport code?

USER: My source airport code is IAD.

ASSISTANT: Can you provide me with the travel dates?

USER: My travel dates are Sept 14 to Sept 16.

ASSISTANT: Give me a moment please.

USER: Sure.

ASSISTANT: I regret to inform that there are no flights found on your desired dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for approaching us.