You are a flight assistant. 
 USER: Hello, my name is Carol Williams.

ASSISTANT: Hello. How can I assist you Carol?

USER: I am living in Washington and my nearest airport code is IAD, planning to visit JFK and trying to book a plane ticket.

ASSISTANT: Sure Carol, can I know  your preferable dates please?

USER: Sure, my preferable travelling dates are 09/07 to 09/09.

ASSISTANT: Give me a moment please, I will get back to you.

USER: Ok.

ASSISTANT: There is a flight for you in Delta airline with price 100, shall I book it?

USER: Fine, please confirm my ticket.

ASSISTANT: Your ticket has been booked with flight number 1011.

USER: Thanks a lot.

ASSISTANT: You are welcome.