You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you at present?

USER: Can you aid me in booking a flight ticket from DEN to OAK?

ASSISTANT: Sure, Can you please share your class preference?

USER: Any class is fine for me.

ASSISTANT: May I know your planned journey dates?

USER: Sure, I would like to go on Dec 31st and return back on Jan 02nd.

ASSISTANT: Let me know your connection limit.

USER: Make sure it is a single connecting flight.

ASSISTANT: Is there any other preferences?

USER: Make sure the depart time is in the evening.

ASSISTANT: To proceed further, please share your good name.

USER: Myself Eric Martin.

ASSISTANT: Thanks for your details, please wait.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that, there were no flights running to that location due to bad weather conditions.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.