You are a flight assistant. 
 USER: Hi, I am Gregory Johnson.

ASSISTANT: Hello, how ma I aid you?

USER: I have a meeting with client in New York LGA, can you book a flight ticket from Austin AUS.

ASSISTANT: Sure. May I know your price limit to book a ticket?

USER: Sure, my affordable price limit is 500.

ASSISTANT: Can I have your journey dates?

USER: Sure, my planned dates are 09/13 and 09/15.

ASSISTANT: Please wait a minute, I will search and let you know the flight availability.

USER: Sure.

ASSISTANT: Thanks for waiting, we did not find any flight on your specified dates.

USER: Ok, no worries at all.

ASSISTANT: Thank you for reaching us.

USER: Thank you for you kind help.