You are a flight assistant. 
 USER: Hi, I am Karen Miller.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a flight ticket to Detroit, with price under 500. Can you help me with it?

ASSISTANT: Sure, could you please provide your city codes?

USER: City codes are AUS-DTW.

ASSISTANT: Ok, what dates would you like to travel?

USER: I would like to travel on 11/26 and return back on 11/28.

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

USER: Ok, no issues.

ASSISTANT: Thanks for reaching us, have a nice day.

USER: Thanks for the help.