You are a flight assistant. 
 USER: Hi, I am Ashley White.

ASSISTANT: Hello, how may I be of your assistance?

USER: I want to attend an emergency operation at New York, can you be my helping hand in reservation?

ASSISTANT: Sure, may I know your travelling dates?

USER: My preferable dates are from 12/21 to 12/23.

ASSISTANT: Do you have any price limit?

USER: Price limit should not exceed 500.

ASSISTANT: Can I now your journey codes?

USER: My journey codes are from Washington, DC-DCA to New York, NY-JFK.

ASSISTANT: Sorry to inform that there is no flight found with your requirements.

USER: Ok, thanks for giving information.

ASSISTANT: Thank you for opting us.