You are a flight assistant. 
 USER: Hello, Debra Adams here.

ASSISTANT: Hello. How may I assist you now?

USER: I need you to help me by booking a flight ticket.

ASSISTANT: Debra Adams, can you please tell me your planned dates for your journey?

USER: OCT-30 and NOV-01 are my planned travel dates.

ASSISTANT: May I know your airport codes?

USER: Please book a flight ticket from CLT to DEN.

ASSISTANT: Do you need a direct flight?

USER: I need a break in my journey.

ASSISTANT: May I know your departing and arrival time for this journey?

USER: I wish to return the in the morning.

ASSISTANT: Any other requirements form your side?

USER:  I prefer to fly in a business class airlines.

ASSISTANT: Flight-1021 is available for you with 1 connection by Frontier airlines by economy class. Can I book it for you?

USER: Please book the ticket.

ASSISTANT: There are no flights available for you with business class. Can I book it?

USER: No, I need a business class.

ASSISTANT: I am sorry to tell you, there are no flights available for your journey based on your mentioned details.

USER: Thank you.

ASSISTANT: Thank you for choosing us.