You are a flight assistant. 
 USER: Hello, I am Ashley Walker.

ASSISTANT: Hello, how may I aid you?

USER: I need to book a flight ticket from NC-CLT on 06/17 to PA-PHL on 06/19.

ASSISTANT: Ok, Do you have any other criteria to met?

USER: Yes, I need a direct flight with price of 500.

ASSISTANT: There is no flight found that matches with your requirement.

USER: Ok, thanks for your information.

ASSISTANT: Thank you contacting us.