You are a flight assistant. 
 USER: Hi, myself George Roberts.

ASSISTANT: Hello George. How can I assist you today?

USER: Can you please check for the best flight from IAD to DCA?

ASSISTANT: Please share your travel dates.

USER: I will depart on 11/23 and return back from DCA on 11/25.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no flight is available on your route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.