You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: David Wilson here. I want to attend a Seminar in Seattle. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, we are here to make your journey comfort. Kindly mention your airport codes.

USER: Thanks for that. My airport codes are LAS and SEA.

ASSISTANT: When are you willing to make your trip?

USER: My travelling dates are 12/16 and 12/18.

ASSISTANT:  Just a moment please, I will get back to you  with flight details.

USER: Ok, I will wait.

ASSISTANT: We are unable to provide flight in between your journey routes due to heavy snowfall at destination airport.

USER: Anyway, thanks for the information.

ASSISTANT: Thank  you for reaching us.