You are a flight assistant. 
 USER: Hello, I am Brandon Martinez.

ASSISTANT: Hello, how can I help you?

USER: Could you please help me book a ticket from Austin, TX - AUS to Washington DC, DC - DCA?

ASSISTANT: Sure, We are here to help you. Can you please provide your travelling details?

USER: Sure, my journey dates are from Jan/23 to Jan/25 with a price limit of 500.

ASSISTANT: OK, Please wait for a moment.

USER: OK,.

ASSISTANT: Thank you for being patient, No flights were found according to your requirements.

USER: OK, thank you.

ASSISTANT: Thank you for contacting us.