You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Scott Lee.

ASSISTANT: How can I aid you at this moment?

USER: Please book a flight ticket from CLT to DCA.

ASSISTANT: Sure, I am here to help you. Could you please provide your journey dates?

USER: Nov, 17 and Nov, 19 are my planned travel dates.

ASSISTANT: Do you have any connection limit for this trip?

USER: I need single connection.

ASSISTANT: May I know your specific depart and arrival timings for this trip?

USER: My return time should be at afternoon.

ASSISTANT: Do you have any other specifications for this trip?

USER: No.

ASSISTANT: Scott Lee, there are no flight services are available on this route with your preferences.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for contacting us.