You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name?

USER: Myself Anthony Williams. Can you please help me out by booking a ticket from DCA to AUS?

ASSISTANT: Ok Williams, I will help you.

USER: My travelling dates are 02/14 and 02/16.

ASSISTANT: Ok, please give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform you, due to some climate changes, there are no flights in the dates you provided.

USER: Ok, thank you for your help.