You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best can I serve you?

USER: Please help me in booking flight ticket from DCA to DEN.

ASSISTANT: Can I know your trip dates?

USER: My trip dates are Oct 08 to Oct 10.

ASSISTANT: Do you need a connecting flight?

USER: I need a direct flight.

ASSISTANT: Do you have any other concerns?

USER: I prefer to travel in normal cost airline.

ASSISTANT: Can I know your good name?

USER: Christopher Rodriguez here.

ASSISTANT: Thank you for your details, we found a direct flight 1000 in United airline with class economy.

USER: You can proceed.

ASSISTANT: Shall I proceed?

USER: Yes, sure.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for booking my flight ticket.

ASSISTANT: Thank you.