You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Larry Baker here.

ASSISTANT: How can I aid you?

USER: I want to attend a seminar in Washington. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, may I know your nearest airport codes please?

USER: My airport codes are from MCO to IAD.

ASSISTANT: May I know your journey dates please?

USER: My travelling dates are from 06/19 to 06/21.

ASSISTANT:  Larry Baker, no flights are available in your route.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.