You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to go to Zilker Park with my friends at Austin. Can you do the reservation?

ASSISTANT: Yes, we can do. May I know your budget for this reservation?

USER: Price should not cross 200.

ASSISTANT: Ok, please share me your planned dates.

USER: My travelling dates are 03/16 and 03/18.

ASSISTANT: Could you please help me with your source code and destination code?

USER: My airport codes are ATL-AUS.

ASSISTANT: Please give me a moment to find the best flight for you.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no flight available on your planned dates.

USER: No problem, Thanks for the information.

ASSISTANT: Can I have your name please?

USER: Andrew Wilson here.

ASSISTANT: Thank you for contacting us.