You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: The travel dates are from July 01 to July 03.

ASSISTANT: Please let me know your source and destination airport codes.

USER: The airport codes are from DEN to ATL.

ASSISTANT: Do you prefer direct or single connected flight?

USER: I prefer a stopover flight.

ASSISTANT: Please let me know if you have any other specifications.

USER: That is it.

ASSISTANT: Can I have your good name please?

USER: I am Christine Walker.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for choosing us.