You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Brenda Wilson.

ASSISTANT: How can I aid you today?

USER: Please help me to book a flight ticket, As I want to visit and interact in the National Gallery of Art, with my clients at New York.

ASSISTANT: Sure, I am happy to help you, may I know your travelling dates?

USER: Sure. I will start my journey on 09/20. I will return on 09/22.

ASSISTANT: Could you please help me with your airport codes?

USER: My source airport code is Atlanta, GA - ATL. My destination is New York, NY - EWR.

ASSISTANT: Please hold on.

USER: Sure.

ASSISTANT: Sorry, no flights found on your requested travelling dates.

USER: Not an issue.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your information.