You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I want to book a flight ticket from ATL to CLT, can you please help me to book a flight ticket?

ASSISTANT: I am here to help you about that. Can you please provide your planned dates of journey?

USER: Sure, my journey dates are Dec 03 and Dec 05.

ASSISTANT: Can you please provide your name for booking purpose?

USER: My name is Ronald White.

ASSISTANT: Do you need any connecting flight for your journey?

USER: I need a connecting flight.

ASSISTANT: Do you have any other requirements for your journey?

USER: My class preference is business.

ASSISTANT: As per your requirements, I have found a direct flight to your region on your planned dates of journey which departures in the morning having a ticket fare of 100 by Frontier airlines. Shall I proceed with the booking?

USER: Ok, please book.

ASSISTANT: Sorry to say this Ronald White, there are no flights in a business class just now all the tickets got sold out.

USER: Thank you for your help.

ASSISTANT: Sorry for the inconvenience.

USER: No problem, thank you for your information.

ASSISTANT: You are welcome, thank you for reaching us.