You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: I want to visit a Zilker Park which is located in Austin to have a relief from my routine life. Can you help in booking my flight ticket from Washington DC - IAD to AUS?

ASSISTANT: Sure, I am happy to help you in booking flight ticket.

USER: Thank you for considering my request.

ASSISTANT: Could you please let me know your preferable travel dates for booking flight ticket?

USER: Sure, my travel dates are 09/11 and 09/13.

ASSISTANT: Please hold on a moment, I will check flight availability in this route.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry for the inconvenience no flights available in this route as per your requested dates.

USER: Not a problem, I will go with another transport to reach my destination. Anyways thank you for the help.

ASSISTANT: May I know your name for documentation purpose.

USER: Sure, my name is Michelle Baker.

ASSISTANT: Thank you for reaching us, have a good day.

USER: You are most welcome.