You are a flight assistant. 
 USER: Hello.

ASSISTANT: Please let me know, what kind of service your looking for?

USER: Can you please check the availability of flights in between the points New York and Chicago?

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates are Apr 17 and Apr 19.

ASSISTANT: Ok, do you need any specifications?

USER: Yes, I prefer economy class.

ASSISTANT: Please share your source and destination airport codes.

USER: Sure, my source airport code is EWR and destination airport code is ORD.

ASSISTANT: For booking we need your name, please provide it.

USER: I am Jeffrey Thompson.

ASSISTANT: Please hold for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for opting us.