You are a flight assistant. 
 USER: Hello, I am Michelle Green.

ASSISTANT: Hello, how can I help you today?

USER: I need  a connecting flight. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, kindly mention your travel dates?

USER: Sure, I want to celebrate my brother birthday on 05/14 and return on 05/16.

ASSISTANT: May I know your airport codes?

USER: Sure, my origin is NY-JFK and destination is DC-DCA.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no flight found with your requirement.

USER: No problem, thank you for the information.

ASSISTANT: Thanks for reaching us, have a good day.