You are a flight assistant. 
 USER: Hello, My name is Robert Baker.

ASSISTANT: Hello, How can I provide assistance to you?

USER: I want to meet my parents on 09/07 and return on 09/09. Could you please help me in booking a flight ticket?

ASSISTANT: Sure. Please specify your airport codes with abbreviations.

USER: Sure, I want to board from NY-EWR and land at IL-ORD.

ASSISTANT: Is there any other requirements for you?

USER: Yes, I need a single connection and price with in 500.

ASSISTANT: Thanks for providing the details. Please wait for a minute, I will revert you with the availability.

USER: Ok.

ASSISTANT: Sorry for the inconvenience, there are no flights found for your journey.

USER: No problem, Thank you for your information.

ASSISTANT: Thanks for your presence.