You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Richard Smith. I want to attend my friend's birthday, I need your help to book a ticket from DC-DCA to IL-ORD.

ASSISTANT: Sure, can you please hold on for a moment?

USER: Could to please help me with that? Sure.

ASSISTANT: Can I know your travel dates?

USER: My travelling dates are 08/12 and 08/14.

ASSISTANT: Sorry, there is no flights found with the details you provided.

USER: Ok, Thank you for the information.

ASSISTANT: Thank you.

USER: You are welcome.