You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: John Scott here. I want to travel from DEN to JFK for attending a seminar. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, can I have your travel dates please?

USER: My travelling dates are from 02/17 to 02/19.

ASSISTANT: Ok, please wait a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry John Scott, no flight is available to you on your dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us, have a good day.