You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Myself Katherine Brown. I would like to meet my friend at Washington, will you help me in booking the flight ticket from HOU to DCA?

ASSISTANT: Sure, I am here to help you with booking. May I know your travelling dates to proceed further?

USER: My travelling dates are 05/24 and 05/26.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for approaching us.