You are a flight assistant. 
 USER: Hi, I am Charles Scott.

ASSISTANT: Hello, how may I aid you?

USER: I want to book a flight ticket to meet my uncle at Charlotte, so please book a direct flight from Chicago.

ASSISTANT: Sure, may i know your travelling dates?

USER: I have planned to travel on 02/29 and return on 03/02.

ASSISTANT: Can you please please provide your journey codes?

USER: My airport codes are IL-ORD and NC-CLT.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: Unfortunately there is no flight found with your requirements.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for availing us.