You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Donna Johnson here. I want to attend a Marriage in Detroit. Can you please help me for booking the flight ticket?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My travelling dates are 05/31 and 06/02.

ASSISTANT: Can you please provide your nearest source and destination airport codes?

USER: My airport codes are DFW and DTW.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I would prefer direct flight.

ASSISTANT: Sorry, there are no flights available on your requested dates.

USER: Anyway, thanks for the information.

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