You are a flight assistant. 
 USER: Hi. This is Stephanie Clark.

ASSISTANT: Hello, can I aid you today?

USER: Can you book me a flight ticket to Washington, to meet my brother and visit National Mall?

ASSISTANT: Sure, let me know your travelling dates?

USER: My journey starts on 12/25 and return will be on 12/27.

ASSISTANT: Could you please share me your airport codes?

USER: Boarding is from Detroit, DTW and landing on Washington, DCA.

ASSISTANT: Do you have any specifications?

USER: I am looking for a connecting flight. The ticket fare must be within 200.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no flights found on your journey routes.

USER: That's ok, not an issue. Thanks for your kind information.

ASSISTANT: Thanks for choosing us.