You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I address you?

USER: I am Richard Mitchell. I am planning to visit the White House in Washington, so please help me in booking a direct flight from New York.

ASSISTANT: Sure, I am willing to help you. Please help me with your travelling dates.

USER: I want to fly on 01/13 and return on 01/15.

ASSISTANT: Ok, can I know your journey codes to proceed further?

USER: My airport codes are NY - JFK, DC - DCA.

ASSISTANT: Wait a minute please.

USER: Sure.

ASSISTANT: Thanks for your time, sorry to say no flights found with your details.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.