You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I would like to book a flight ticket from JFK to OAK for attending a event.

ASSISTANT: Sure, We are here to help you. Can I know your travelling dates?

USER: ,My travelling dates are June 11 and June 13.

ASSISTANT: Do you need any break?

USER: I prefer to travel in a direct flight.

ASSISTANT: May I know your name?

USER: I am Nancy HARRIS.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT:   We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: No, worries, thank you for the information.

ASSISTANT: Thank you for reaching us.