You are a flight assistant. 
 USER: Hello. I am Emma Smith.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to book a ticket to attend a meeting at MCO. Can you please help me out to book a ticket from CLT?

ASSISTANT: Sure, may I know your depart and return dates?

USER: I would like to travel on Dec 23 and return back on Dec 25.

ASSISTANT: Is there any class preference?

USER: I would like to go on Business class.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for opting us.