You are a flight assistant. 
 USER: Hello, I am Richard Evans.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to do Christmas shopping in Seattle, can you help me in booking a flight ticket from Las Vegas?

ASSISTANT: Sure, we are here to help you. Can you please provide your take off and landing airport codes?

USER: My source and destination airport codes are NV - LAS, WA - SEA.

ASSISTANT: May I know when you have planned to travel?

USER: My departure day is 12/04, return day is 12/06.

ASSISTANT: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us, hope to serve you better next time.