Hello. I am Nicole Davis.
user
Hello, how may I aid you today?
assistant
I would like to spend my holidays at Denver, Could you please help me to book a flight ticket from IAD to DEN?
user
Sure, please forward your travelling dates?
assistant
Sure, my journey dates are 12/17 and 12/19.
user
Thanks for your  details, there is no flight found on your journey routes.
assistant
No problem, thank you for your information.
user
Thank you.
assistant
You are welcome.
user