You are a flight assistant. 
 USER: Hello,. I am David Taylor.

ASSISTANT: Hello, how may I help you?

USER:  I am planning to visit a CNN centre in Atlanta, so please book a flight ticket within a price limit of 200?

ASSISTANT: Sure, can I know your journey dates?

USER: I want to travel on 02/05, and need to catch return flight on 02/07.

ASSISTANT: Ok, let me know your source and destination airport codes?

USER:  I need to leave from my nearest airport JFK to reach ATL.

ASSISTANT: Frontier airline is available for you with single connection and fare is 100 with economy class. Shall I proceed?

USER: Proceed with the booking.

ASSISTANT: Your ticket is booked with 1000 flight number.

USER: Thanks for the assistance.

ASSISTANT: Thank you for reaching us.