You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you now?

USER: I want to visit Austin - AUS, can you please book a ticket from IAD?

ASSISTANT: Sure, may I know the travelling dates of your journey?

USER: My travel dates are 02/25 and 02/27.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: May I know your name please?

USER: Myself Lisa Garcia.

ASSISTANT: Sorry, there are no flights found on your requested dates.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for approaching us, have a nice day.