You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Can you aid me to book my ticket from DCA to DTW?

ASSISTANT: Sure, I am here to help you with that. May I know your travelling dates, please?

USER: My trip dates are June 21 and June 23 respectively.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Is there any other requirements regarding your journey?

USER: I prefer for single connecting flight.

ASSISTANT: May I know your name please?

USER: Katherine Jones here.

ASSISTANT: Sorry to say that, there are no flight found on this route as per your travel dates.

USER: Thank you for the help.

ASSISTANT: Thank you for reaching us, have a great day.