You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know how best I can help you today?

USER: I am Laura King need to book a ticket to DCA  from OAK, can you please help me in booking?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: My preferred dates are from Mar 18 to Mar 20.

ASSISTANT: Do you have any other requirements?

USER: I would like to travel in business class with single connecting flight.

ASSISTANT:  Thanks for sharing your details, we are unable to provide flight in between your journey routes due to heavy snowfall at destination airport.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.