You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to flight booking agency. How may I help you?

USER: I would like to head from New York to meet my parents at Los Angeles. Can you help me book a flight ticket within the price of 200?

ASSISTANT: May I know your airport codes please?

USER: They are from JFK to LAX.

ASSISTANT: What are your desired travelling dates?

USER: My dates of travel are 04/17 and 04/19.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: May I know your good name?

USER: My name is Katherine Green.

ASSISTANT: Sorry to inform you, there is no flights available on your requested route. Thank you for reaching our services.

USER: Thank you for the information.

ASSISTANT: Have a nice day.