You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Samuel White. I am planning to go for a round trip to Washington, DCA. Can you help me in booking a flight ticket with a connecting flight?

ASSISTANT: Sure. From where you are planning to travel?

USER: It is a round trip, airport code is DCA.

ASSISTANT: May I know your preferable travelling dates?

USER: My travelling dates are from 12/16 to 12/18.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: There is a Delta airline with flight number 1001 and price is 100 available according to your request.

USER: Ok, You can proceed.

ASSISTANT: Your reservation has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for reaching us and have a nice day.