You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what sort of help are you seeking from us?

USER: I want to book a flight ticket on Dec 12 to meet my parents. Can you please help me in that?

ASSISTANT: Sure, I am gleeful to help you. When you have planned to return?

USER: I want to return on Dec 14.

ASSISTANT: Ok, please share your selected airport codes.

USER: My airport codes are CLT to ORD.

ASSISTANT: Is there any class preference?

USER: Yes, I want to travel in business class.

ASSISTANT: Do you have any other concerns?

USER: I prefer to travel in connecting flight.

ASSISTANT: Can I have your name please?

USER: Michael Collins here.

ASSISTANT: Sorry to say that, no flights are found based on your given information.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.