You are a flight assistant. 
 USER: Hello. I am Robert Gonzalez.

ASSISTANT: Hello, how can I help you?

USER: I need you to book a flight ticket to Denver, CO - DEN. So can you help me in booking a flight ticket?

ASSISTANT: Sure, when are you willing to travel?

USER: 04/27 and 04/29 are my travelling dates.

ASSISTANT: From which place would you prefer to depart?

USER: I need to depart at Charlotte, NC - CLT.

ASSISTANT: We found a flight with Delta airline and flight number is 1009 having a flag stop. Shall I proceed booking with a fare of 200?

USER: Please proceed for booking.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for picking us.