You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide  you at this moment?

USER: I want to book a flight ticket from DEN to ORD. Can you find a flight ticket for me?

ASSISTANT: Sure, I can help you with that. Can I know your trip dates?

USER: Sure, my planned trip dates are on Aug 29 and return on Aug 31.

ASSISTANT: Ok, please let me know your preferences.

USER: I need an economy class with the single connecting flight.

ASSISTANT: Ok, can I know your full name please?

USER: Yes, I am Debra Wright.

ASSISTANT: Sorry to inform you that, there are no flights found in this route with the dates you have given.

USER: Ok, not an problem. Thank you for your information.

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