You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I am Carolyn Turner. I want meet my friend who is working as a doctor at Washington DC-DCA,help me in booking my flight ticket from.

ASSISTANT: Sure, May I know the source code?

USER: I want to start from NY-JFK.

ASSISTANT: Please help me with your travel dates.

USER: 04/06 to 04/08 are my travelling dates.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us.