You are a flight assistant. 
 USER: Hello, my name is Ashley Campbell.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a flight ticket on 05/23 for attending a cultural program in New York.

ASSISTANT: Sure, please provide me your source and destination codes.

USER: My source and destination airport codes are CA - LAX, NY - JFK.

ASSISTANT: May I know your further journey details?

USER: My return day is 05/25.

ASSISTANT: Please provide me your price limit.

USER: My price limit is 500.

ASSISTANT: Thanks for providing your details.

USER: Ok.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: No issue, thanks for your service.

ASSISTANT: Thank you for choosing us.