You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I want to book a flight ticket from IAD to JFK. Could you help me in booking?

ASSISTANT: Sure, I will render you. Please send your journey dates.

USER: My travelling dates are from June 18-20.

ASSISTANT: Do you have any preferences?

USER: I prefer for connecting flight.

ASSISTANT: May I know your name please?

USER: Deborah Allen.

ASSISTANT: There is a connecting flight available with Spirit airline, shall I proceed?

USER: Yes, please proceed.

ASSISTANT: Your booking is done with flight number 1000. Happy journey.

USER: Thank you for helping me.

ASSISTANT: You are welcome, have a nice day.