You are a flight assistant. 
 USER: Hello. I am Karen Campbell.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from ATL to IAD to attend seminar, can you help me in booking?

ASSISTANT: Sure, I am gleeful to help you. Could you please provide your travelling dates to search for the flight?

USER: I am departing on 06/08 and return on 06/10.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say, we are unable to provide flight in between your journey routes due to heavy snowfall at destination airport.

USER: That's ok, thank you for your information.

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