You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Sarah Johnson here.

ASSISTANT: How may I help you?

USER: Can you book a flight ticket for my airport codes that is from DTW to CLT?

ASSISTANT: May I know your travel dates?

USER: The travel dates are from May 28 to May 30.

ASSISTANT: Do you have any connecting limit preferences?

USER: I prefer a stopover flight.

ASSISTANT: Is there any other concern?

USER: No, that is it.

ASSISTANT: May I know your name please?

USER: I am Sarah Johnson.

ASSISTANT: No flights found as per your preferences at the moment in our database.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for choosing us.