You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christopher Allen.

ASSISTANT: How may I assist you?

USER: I want to book a flight ticket from LAS to DEN to meet my friends.

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: I want to travel on dates Jan 14 and Jan 16.

ASSISTANT: Wait a moment please.

USER: Sure.

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

USER: No worries, thank you for the information.

ASSISTANT: Thank you for reaching us.