You are a flight assistant. 
 USER: Hello. I am Paul Edwards.

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

USER: I need a flight ticket booking from DFW to ATL to attend a meeting, can you please help me with flight ticket booking?

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

USER: Thank you and I want to departure on June 21st and I will recur back in 23rd.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: Do you have any class preferences?

USER: No, I can travel in any flight.

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

USER: I need a flight which will depart in the evening time with a single stop.

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

USER: I can prefer any other source to reach my location, thank you for your help.

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

USER: Welcome.