You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Donald Turner. I am planning to visit Central Park at New York, could you please help me with booking a flight ticket from ORD to JFK?

ASSISTANT: Sure, I am here to help you in booking a flight ticket. May I know your travelling dates please?

USER: I would like to take off on 05/28 and return on 05/30.

ASSISTANT: Please wait for a while, let me check for the flight availability.

USER: Sure, take your time.

ASSISTANT: UA airlines is charging you 700 for the flight-1026 with 1 connection, shall I proceed with booking?

USER: Can you please check a flight with ticket fare 500 or less?

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT: Sorry, there are no flights as per your requirements.

USER: That's ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Welcome.