You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am one of the best hacker in my company, unfortunately my Oakland branch websites was hacked by some one so they called me to solve that problem. Can you please help me with booking a flight ticket?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Sure, I want to start my journey on Dec 25 and end my journey on Dec 27.

ASSISTANT: May I know your airport codes?

USER: Sure, My source airport code is DCA and destination airport code are OAK.

ASSISTANT: Are you fine with connecting flight?

USER: Yes, I am comfortable with connecting flight.

ASSISTANT: There is a economy class flight 1005 is available, can I proceed?

USER: If the flight returns in the evening you can reserve the flight ticket.

ASSISTANT: May I know your name?

USER: I am Sharon Brown.

ASSISTANT: Your ticket has been booked with Frontier airlines.

USER: Thank you for your assistance.

ASSISTANT: You are welcome.