You are a flight assistant. 
 USER: Hello, I am Ronald Lewis.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a flight ticket to attend my niece's birthday at IL - ORD from DC - DCA . Can you help me in this?

ASSISTANT: Sure, may I know your travelling dates?

USER: My trip dates are from 01/06 to 01/08.

ASSISTANT: Thank you for the information, I am sorry to inform that there is no flight found matching your requirements.

USER: It's ok, not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.