You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am James Moore. I want to book a flight ticket from IAD to DCA. Could you help me in booking?

ASSISTANT: Sure, can you provide your journey dates?

USER: My travelling dates are from July 13-15.

ASSISTANT: Do you have any specifications?

USER: I need a halt.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.