You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me to book a flight from OAK to DEN?

ASSISTANT: Sure, may I know the travelling dates?

USER: My travel dates are Apr 19 to 21.

ASSISTANT: Do you have any connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Are there any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: I am Samuel Garcia.

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

USER: No problem, thanks for the information.

ASSISTANT: Thank you for opting us.