You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Scott Lee. I want to celebrate my birthday at New York, could you please help me to book my flight ticket from CLT to LGA?

ASSISTANT: Sure, can you share me your travelling dates?

USER: I want to depart on Mar 23 and I want to return back on Mar 25.

ASSISTANT: Do you have any specifications?

USER: I prefer for a business class.

ASSISTANT: Please wait a moment.

USER: Sure, please check for the single connection flight.

ASSISTANT: Sorry, no flights are available on your desired route.

USER: Sad to hear that. Anyway, thank you for checking.

ASSISTANT: Thank you for reaching us.