You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Scott Roberts.

ASSISTANT: Glad to meet you Scott.

USER: I have a business meeting in Washington. Can you help me for booking?

ASSISTANT: Sure, may I know your travel dates please?

USER: My travelling dates are from 11/16 till 11/18.

ASSISTANT: Ok, may I know your airport codes please?

USER: My airport codes are from DEN to DCA.

ASSISTANT: Ok, hold on for a moment. Sorry Scott, there are no flights available on your requested dates.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome. Thank you for choosing us.

USER: Welcome.