You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you aid me to book a flight ticket from DEN to LGA?

ASSISTANT: Please provide your journey dates.

USER: My trip dates are Nov 12 and Nov 14 respectively.

ASSISTANT: Do you need any other specifications?

USER: I prefer for connecting flight preferences.

ASSISTANT: May I know your name?

USER: Ryan Green here.

ASSISTANT: Sorry to inform you that there are no flights available on your routes.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us.