You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know how best I can help you today?

USER: Kathleen Anderson here. I would like to book a ticket to Washington DC, where I an invited for congress meet.

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: Sure, my travel dates are May 14 and May 16.

ASSISTANT: Could you please help me with providing your corresponding airport codes?

USER: My airport codes are BOS and IAD.

ASSISTANT: Do you require any stopovers in your journey?

USER: Not in stop overs but, departure time would be afternoon and class preference would be economy.

ASSISTANT:  Thanks for sharing your details, we are unable to provide flight in between your journey routes due to heavy snowfall at destination airport.

USER: No problem, thank your for the information and your time.

ASSISTANT: Thank you for reaching us.