You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you aid me to book a flight ticket from LAS to OAK?

ASSISTANT: Sure, could I have your trip dates, please?

USER: My trip dates are Nov 26 and Nov 28 respectively.

ASSISTANT: Do you have any preferences?

USER: I prefer for connecting flight and my depart time should be in the afternoon.

ASSISTANT: On what name, do I need to reserve the ticket?

USER: Robert Allen here.

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

USER: Thank you.

ASSISTANT: Thank you for opting us.