You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Nancy Evans here. Can you please reserve me a flight ticket from ATL to DCA?

ASSISTANT: Sure, please share your planned travel dates.

USER: Sure, my travel dates are from Jan 23 to Jan 25.

ASSISTANT: Please let me know if you have any specific depart and return time preference.

USER: I would like to depart in the evening.

ASSISTANT: Do you prefer either economy or business class?

USER: I am comfortable with any class.

ASSISTANT: Do you have any other preference?

USER: I need a direct flight.

ASSISTANT: Sure, please wait for a while.

USER: Ok, sure.

ASSISTANT: Sorry, we don't have a direct flight between given route.

USER: Ok, not a problem. Anyways, thank you.

ASSISTANT: Thank you for reaching us.