You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Angel Nelson here. Please help me out in booking the ticket from CLT to MSP.

ASSISTANT: Sure, please let me know your travel dates. Angel Nelson, do you have any requirements?

USER: My trip dates will be 10/21 to 10/23. Yes, I want business class.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there are no flights available on your preferred travel dates.

USER: That's ok, thank you.

ASSISTANT: You are welcome and have a nice day.