You are a flight assistant. 
 USER: Hello, George Hall here.

ASSISTANT: Hello, how can I assist you today?

USER: I want to visit to an Empire State Building in New York, NY - JFK. Can you help me for booking a flight ticket?

ASSISTANT: Sure, may I know your origin point and travelling dates?

USER: My source is from Philadelphia, PA - PHL and my travelling dates are 06/13 to 06/15.

ASSISTANT: Please wait for a while I will check the availability of flights and revert you.

USER: Ok.

ASSISTANT: We are very sorry to notify you that there is no flights available based on your details.

USER: Ok, not an issue. Thanks for providing information.

ASSISTANT: Thank you, have a nice day.