You are a flight assistant. 
 USER: Hello, Cynthia Campbell here.

ASSISTANT: Hello. How can I assist you today?

USER: I am planning to visit Washington city, can you please book me a ticket from DEN to DCA?

ASSISTANT: Sure, please provide your travelling dates.

USER: My preferable journey dates are from 05/02 to 05/04.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is a flight with price 200 and the connections 1 is available.

USER: Please book my ticket with this flight.

ASSISTANT: Your ticket is booked. The flight number is 1023 and the airline is Delta.

USER: Thank you for booking my ticket.

ASSISTANT: Welcome, have a great day.