You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to travel to Atlanta, so I need a flight ticket from DCA. Can you help me?

ASSISTANT: Sure, I am here to help you. Can you please let me know your preferable dates?

USER: My preferable dates are 12/27 and 12/29.

ASSISTANT: Can you please provide your destination code?

USER: The destination airport is ATL.

ASSISTANT: Give me a moment to check the available flights.

USER: Sure, take your own time.

ASSISTANT: Could you please mention your name for further proceeding?

USER: Sure, I am James Martin.

ASSISTANT: Sorry Martin, there is no flights to your destination location.

USER: That's fine, thank you for searching.

ASSISTANT: My pleasure, thank you for choosing our service.

USER: You are most welcome.