You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you today?

USER: Please book a ticket from Washington DC-DCA to Austin, TX-AUS.

ASSISTANT: Sure, may I know your price limit?

USER: Price limit 500.

ASSISTANT: Could you please help me with your journey dates?

USER: My journey dates are from 08/14 to 08/16.

ASSISTANT: To proceed further, can I have your name please?

USER: I am Debra Hernandez.

ASSISTANT: Unfortunately, no flights were available at your preferred location.

USER: Thank you.

ASSISTANT: Thank you for choosing us.