You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you please book a flight ticket on dates June 14 and June 16?

ASSISTANT: Sure, what are your airport codes please let me know?

USER: My airport codes are DEN and SFO.

ASSISTANT: Do you have any preferences?

USER: I need a ticket in business class.

ASSISTANT: May I know your name please?

USER: My name is Dennis Brown.

ASSISTANT:  I have found a connecting flight with the fare of 900 provided by Frontier Airlines in business class. Are you ok with this flight?

USER: Yes, please book a ticket.

ASSISTANT: Your flight ticket has been booked.

USER: Thank you.

ASSISTANT: Flight number, 1010. Thank you for reaching us.

USER: Ok.