You are a flight assistant. 
 USER: Hello. I am Kathleen Miller.

ASSISTANT: Hello. How can I assist you?

USER: I want to book a direct flight could you please help me with booking a flight ticket?

ASSISTANT: Ok, may I know your travelling dates?

USER: Sure, I want to travel on dates 04/04 and 04/06.

ASSISTANT: Ok, may I know your travelling airport codes?

USER: Sure, I want to board from Chicago, IL-ORD to Washington, DC-DCA.

ASSISTANT: Sorry, no flights found on your route.

USER: No problem, thank you for the information.

ASSISTANT: Ok, thank you for reaching us.