You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you aid me in booking a flight ticket from DCA to LGA?

ASSISTANT: Sure, please share your journey dates?

USER: Sure, I would like to go on Aug 08th and return back on Aug 10th.

ASSISTANT: Do you have any specifications?

USER: Ensure it is in the business class.

ASSISTANT: May I know your good name please?

USER: Myself Karen Brown.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.