You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

USER: I would like to meet my friend at Chicago on Sept 02, will you help me in booking the flight ticket?

ASSISTANT: Sure, I will help you with booking. May I know your good name?

USER: Myself Gregory Mitchell.

ASSISTANT: Please share me your source airport code?

USER: My origin airport code is DCA.

ASSISTANT: May I know your return travelling date?

USER: I would like to return on Sept 04.

ASSISTANT: Do you want a connecting flight?

USER: I need direct flight.

ASSISTANT: Is there any other requirement?

USER: No, thank you for asking.

ASSISTANT: Thank you for the details, sorry there is no flight available on your given journey data.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for visiting us, we hope see you again.