You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I assist you?

USER: I am Michelle Green.I need a flight reservation. Could you please search for it?

ASSISTANT: OK, I am here to help you. To proceed for booking, I need to Know your journey points and schedule dates?

USER: Sure, I need to travel to Washington,DC - IAD from Austin, TX - AUS. My journey dates are departure on May 14 and return on May 16.

ASSISTANT: OK,Please wait. Let me check what flights are available.

USER: OK.

ASSISTANT: Thanks for waiting. Sorry there are no flights are available on your journey dates.

USER: OK, thanks for your information.

ASSISTANT: Thanks for connecting us, have a nice day.