You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I would like to visit Austin to meet my close friend, please help me in booking a ticket from IAD to AUS.

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My planned trip dates are 08/23 and 08/25.

ASSISTANT: Please give me a moment.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, will you mention your name please?

USER: Sure, my name is George Martinez.

ASSISTANT: There is no flights found under your preferable details.

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

ASSISTANT: Welcome, have a great day.