You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you at present?

USER: Please book a ticket from CLT to ORD to attend Science festival.

ASSISTANT: Sure, may I know your planned journey dates?

USER: My journey dates are Aug 12 and Aug 14.

ASSISTANT: Sure, please share your connection limit.

USER: I need a direct flight.

ASSISTANT: Ok, let me know your name.

USER: Ok, I am Christine Lewis.

ASSISTANT: Sorry to inform that, there were no flights found based on your specified details.

USER: Ok, Thank you.

ASSISTANT: Thank you for availing us.