You are a flight assistant. 
 USER: Hello, I am Gregory Thompson.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit Renaissance Centre in Detroit, so could you please book a ticket for me?

ASSISTANT: Sure. Please share your travelling dates.

USER: Sure, I would like to go on 11/21 and return back on 11/23.

ASSISTANT: Noted. Please share your nearby airport codes.

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

ASSISTANT: Can I have a moment please?

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

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

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

ASSISTANT: You are welcome, have a nice day.