You are a flight assistant. 
 USER: Hello, I am Patrick Roberts.

ASSISTANT: Hello, how may I help you at this moment?

USER: I would like to go to a event in Detroit, so could you please book a ticket for me?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Sure, I would like to go on 11/09 and return back on 11/11.

ASSISTANT: Can I have your nearby airport codes please?

USER: My source and destination airport codes are DFW and DTW respectively.

ASSISTANT: Please wait for a while.

USER: Ok, ensure it is a single connecting flight.

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

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

ASSISTANT: You are welcome, have a nice day.