You are a flight assistant. 
 USER: Hello, I am George Adams.

ASSISTANT: Hello, how can I help you?

USER: I want to book a direct flight to attend Arts and Crafts festival at Charlotte. Can you book a ticket on 08/11?

ASSISTANT: Sure, may I know your airport codes?

USER: I would like to start my journey from Denver, CO - DEN. My destination airport code is NC - CLT.

ASSISTANT: May I know your return dates?

USER: Sure, I intend to return on 08/13.

ASSISTANT: Please mention your lay by's.

USER: I have already provided.

ASSISTANT: Sorry there are no flights find on your requested dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for approaching us.