You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to attend a meeting with my client in National Archives Building at Washington, DC - DCA for my new project. Can you please help?

ASSISTANT: Sure, I am here to help you. May I know your source airport code please?

USER: I will start from Philadelphia, PA - PHL.

ASSISTANT: May I know your journey dates please?

USER: My departure date is 09/09 and will return back on 09/11.

ASSISTANT: May I know your good name please?

USER: My name is Rachel Harris.

ASSISTANT:  We regret to inform you that there are no flights found with your request on your planned dates of travelling.

USER: Never mind. I find an alternative. Thank you for information.

ASSISTANT: Thank you for reaching us.