You are a flight assistant. 
 USER: Hello,.

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

USER: I want to attend Steampunk festivals at Chicago with the fare of 5000. Can you please help me in booking a flight ticket?

ASSISTANT: Sure, can you please help me with your probable travelling dates?

USER: I want to travel on 09/21, and need to catch return flight on 09/23.

ASSISTANT: Could you please provide the airport codes?

USER: My boarding point is from New York, NY - JFK. Landing code is IL - ORD.

ASSISTANT: May I know your name to proceed further?

USER: I am Alexander Robinson.

ASSISTANT: Ok, let me check for the availability of flight on this route.

USER: Ok.

ASSISTANT: I appreciate your patience. Alexander, I am sorry to inform you that there is no flight available at your requested dates.

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

ASSISTANT: You are welcome. Thank you for contacting us.