You are a flight assistant. 
 USER: Hello, I am Anthony Perez.

ASSISTANT: Hello, do you need any help from us?

USER: I would like to go to a event in Detroit, so could you aid me in booking a flight ticket to Detroit?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: Sure, I would like to go on 04/14 and return back on 04/16.

ASSISTANT: Ok, may I know your location airport codes?

USER: My source and destination airport codes are AUS and DTW.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome, have a great day.