You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you today?

USER: I am planning to visit Los Angeles, will you help me in booking the flight ticket from DCA to LAX?

ASSISTANT: Sure, let me know your journey dates?

USER: My preferable journey dates are Feb 14 and Feb 16.

ASSISTANT: Do you have any connection limit?

USER: I need a flight with single connection.

ASSISTANT: Is there any other preferences?

USER: No, thank you for asking.

ASSISTANT: May I know your name?

USER: Myself William Rodriguez.

ASSISTANT: Thanks for your details, there is no flight found on your desired journey routes.

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

ASSISTANT: Thank you for opting us.