Hi.
user
Hello. How can I assist you today?
assistant
I am Matthew Walker. I would like to book a ticket from IAD to  PHX, can you help me?
user
Sure, I am here to help you with that booking. Can you please provide your dates of travel?
assistant
My travel dates are 10/18 and 10/20.
user
Please wait for a moment.
assistant
Sure.
user
Sorry to say, there are no flights available on your route as per your given travel dates.
assistant
No problem, thanks for checking.
user
Thank you for contacting us. Have a great day.
assistant