You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I aid you today?

USER: I am Gary Lee. I am planning to visit White house in Washington,IAD. So, please book a flight from New York, EWR.

ASSISTANT: Sure, we are here to help you. May I know when you want to travel?

USER: I planned to go on 03/26 to 03/28.

ASSISTANT: There is no flight found to your route.

USER: Ok, I will go for other source.

ASSISTANT: Thank you for reaching us.

USER: Thank you.