You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Sharon Johnson here. I want to book a flight from ATL to DEN, can you please help me in booking a flight ticket?

ASSISTANT: Sure, I am here to assist you. Please help me with your travel dates.

USER: Sure, my travel dates are from 03/02 to 03/04.

ASSISTANT: Sorry to say you Sharon, there is no flight available on your preferred dates.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: You are welcome and have a nice day.