You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I'm Anna Campbell. I am planning to attend music concert at AUS, can you please help me with booking a flight ticket from ORD?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Sure, I would like to take off on 04/16 and return back on 04/18.

ASSISTANT: Ok, please hold on for a moment.

USER: Ok, but please make sure that the price limit does not exceed 500.

ASSISTANT: Sorry to say, no flights were available on your dates.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: You are welcome.