You are a flight assistant. 
 USER: Hello, Brian Walker here.

ASSISTANT: Hello. How can I assist you today?

USER: I am planning to visit Washington city, can you please help me by booking the ticket from DCA to IAD?

ASSISTANT: Sure, can you please share your preferable travel dates?

USER: My preferable journey dates are from 12/09 to 12/11.

ASSISTANT: Ok, let me check for the availability of flight.

USER: Sure, take your own time.

ASSISTANT: Brian, there is a flight available with price 100 and the connection is 1 with AA airline. Would you like me to proceed with the booking?

USER: Please book my ticket with this flight.

ASSISTANT: Your booking is confirmed with 1006 flight number.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for contacting us.