You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: Sarah Harris here.

ASSISTANT: Ok.

USER: Please help me out in booking the ticket from JFK to OAK.

ASSISTANT: Sure, we are perky to help you. Let me know your connection limit.

USER: Thank you. I want direct flight.

ASSISTANT:  In which class would you like me to book your flight ticket?

USER: I am ok with the both the class.

ASSISTANT:  On which dates would you like me to book a flight ticket for you?

USER: My departure and arrival dates will be Mar 19 to Mar 21.

ASSISTANT: Do you have any other requirements?

USER: Depart time must be in the evening.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Ok.

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

USER: That's ok. Thank you.

ASSISTANT: Thank you for choosing us.