You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Donna Davis. I am Politician. I want to attend a meeting in LAX, can you help me out in book a flight ticket from IAD?

ASSISTANT: May I know your desired travel dates please?

USER: My planning dates are 10/17 and 10/19.

ASSISTANT: Please wait a while, I will check and inform you.

USER: Ok, take your own time.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: That's ok, I will choose another source to reach my destination.

ASSISTANT: Thank you for opting us.