You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I'm Helen Wilson. I am planning to attend convocation meeting at Denver, can you please help me with booking a flight ticket?

ASSISTANT: Ok, may I know your planned dates for your journey?

USER: Sure, I would like to take off on 01/11 and return back on 01/13.

ASSISTANT: Can I know your airport codes also?

USER: My source airport code is DCA and the destination airport code is DEN.

ASSISTANT: Flight-1001 by Spirit airlines is available with 1 connection at the price of 100. Would you like to book it?

USER: Yes, please proceed with the booking. I appreciate your help, thank you.

ASSISTANT: Your reservation is successfully confirmed, thank you for choosing our agency.

USER: Thank you for your help.

ASSISTANT: Have a safe flight, enjoy your trip.