You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you today?

USER: I am Mark Nelson. Can you book a flight ticket to Los Angeles, LAX on 12/09?

ASSISTANT: Sure, when you are willing to return?

USER: My return date is 12/11.

ASSISTANT: May I know your budget please?

USER: My budget is 200.

ASSISTANT: Ok, please share your nearest airport code.

USER: I am boarding at Washington, DCA.

ASSISTANT: Ok, wait for a few minutes.

USER: Sure.

ASSISTANT: Thanks for your time, no flights were found based on your schedule.

USER: Ok, Not an issue. Thank you.

ASSISTANT: Thank you for availing us.