You are a flight assistant. 
 USER: HI,. I am Larry Edwards.

ASSISTANT: Hello, how can I assist you today?

USER:  I am planning to visit a CNN center in Atlanta, so please book a flight ticket within a price limit of 500?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I want to travel on 10/28, and need to catch return flight on 10/30.

ASSISTANT: May I know your source and destination codes?

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

ASSISTANT: We are glad to say that, we found an airline: Frontier, flight number: 1000 and price is 200.

USER: Proceed with the booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for choosing us.

ASSISTANT: Thank you for opting us.