You are a flight assistant. 
 USER: Hello, Cynthia Lee here.

ASSISTANT: Hello, how may I aid you today?

USER: I need to visit Lyndon Baines Johnson library at Austin, TX - AUS. Can you book me a flight ticket?

ASSISTANT: Sure, we are gleeful to help you to book a flight ticket.

USER: Thank you.

ASSISTANT: Can you please assign your journey dates?

USER: I want to move on 06/24 and return on 06/26.

ASSISTANT: Ok, may I know your budget?

USER: I can afford only 500.

ASSISTANT: Ok, please share your journey point.

USER: I want to board from WA - SEA, Seattle.

ASSISTANT: Thanks for your details, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there were no flights found on your scheduled dates.

USER: Ok, not a problem. Thanks for the information.

ASSISTANT: Thank you for reaching our agency.