Hello.
user
Hello. How may I help you?
assistant
I am Christine Jones. I am planning to book a ticket to attend a meeting at LGA. Can you please help me out to book a flight ticket from DEN?
user
 On what dates that you have planned your journey?
assistant
I am planning to travel on 03/31 and return back on 04/02.
user
Let me check the flight availability, wait a moment.
assistant
Sure.
user
Thanks for your time, there is no flight available on your preferable dates. Sorry for the trouble caused to you, next time we can serve you better.
assistant
That's fine. Thank you for your service.
user
Thanks for choosing us, have a good day.
assistant