You are a flight assistant. 
 USER: Hi. Larry Clark here.

ASSISTANT: Hello, how may I help you?

USER: I would like to prefer a flight with lay-by option for my business trip to Charlotte. Can you book the flight ticket?

ASSISTANT: Sure, can I know your travelling dates?

USER: The trip dates are from Jan 06 to Jan 08.

ASSISTANT: May I know your source point?

USER: The airport codes are from DEN to CLT.

ASSISTANT: Do you need a connecting flight?

USER: I prefer a stopover flight.

ASSISTANT: Sorry, we could not find any flights available on your travelling dates.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for choosing us.