You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: Can you please help me to book a flight ticket from DFW to reach ATL?

ASSISTANT: Sure, can you please provide your preferable dates of travelling?

USER: Thank you. I am willing to travel on the dates of Aug 11 and Aug 13.

ASSISTANT: Do you have any connection limit?

USER: Yes, I am looking for a single connecting flight.

ASSISTANT: Any more specifications do you have?

USER: No, thanks for asking.

ASSISTANT: May I know your name please?

USER: My name is John Campbell.

ASSISTANT: Please wait a moment to check the flights.

USER: Sure, take your own time.

ASSISTANT: We regret to inform you that, there are no flights available for your journey with your requested dates of travelling.

USER: It's ok, not a problem with that. Thank you for your time.

ASSISTANT: Thank you for approaching us, have a great day.

USER: Most welcome.