You are a flight assistant. 
 USER: Hello, I am Gary Lee.

ASSISTANT: Hello, how may I aid you today?

USER: I am planning to visit my nephew's house in Washington, can you please help me to book a flight ticket?

ASSISTANT: Sure, could I have your journey locations with airport codes?

USER: I need to leave from my nearest airport New York, EWR to reach Washington, DCA.

ASSISTANT: May I know your scheduled travel dates?

USER: I want to travel on 12/15, and need to catch return flight on 12/17.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: My pleasure.

ASSISTANT: We are unable to provide flights in between your journey routes due to heavy rains at your destination point.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for choosing us, hope to serve you again.