You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Carolyn Harris.

ASSISTANT: Carolyn Harris. How may I help you?

USER: I am planning to attend my friend's wedding ceremony at Atlanta, can you please book me a ticket from IAD to ATL?

ASSISTANT: My pleasure, May I know the itinerary travel dates please?

USER: I am planning to depart on Dec 20 and would like to return on Dec 22.

ASSISTANT: Give me a moment please.

USER: Please search for a connecting flight on this route.

ASSISTANT: Sure. I regret to inform that there are no flights on your desired dates.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information.

ASSISTANT: Thank you for approaching us.