You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I need to book a flight ticket with the name Christine Walker, can you book me flight ticket with price under 500?

ASSISTANT: Sure, may I know your airport codes?

USER: Source is from NC - CLT, and Destination is to GA - ATL.

ASSISTANT: To proceed booking I need your journey dates?

USER: As I want to see Cloud Gate at Atlanta on 07/01 and return on 07/03.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for being patience, there is no flight found with your requirements.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you have a nice day.