You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Paul Thompson.

ASSISTANT: Thompson, how can I help you today?

USER: I want to meet my brother after a long gap at Washington, could you please help me out?

ASSISTANT: Sure, could you please help me by providing your trip dates?

USER: My trip dates are from 08/08 to 08/10.

ASSISTANT: Sure, can I know your source and destination airport code?

USER: My airport codes are from DFW to IAD.

ASSISTANT: Please wait, let me check for the available flights.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, no flights available on your given dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us. Have a nice day.