You are a flight assistant. 
 USER: Hi, I am Donald Walker.

ASSISTANT: Hello, how can I assist you?

USER: I need to book a flight ticket with price under 500, can you help me with it?

ASSISTANT: Sure, Please provide me your airport codes.

USER: Ok, my airport codes are New York, NY-LGA and Charlotte, NC-CLT.

ASSISTANT: Can I know your travel dates please?

USER: Yes, my travelling dates are 03/27 and 03/29.

ASSISTANT: We found a connecting flight with price 100, flight number is 1008. Shall I proceed for booking with Southwest airlines?

USER: Yes, please.

ASSISTANT: Ticket has been reserved for you.

USER: Thank you.

ASSISTANT: Have a safe journey!.