Hello, I am Joseph Lewis.
user
Hello. How can I  help you?
assistant
Can you search for the flights available from DTW to DEN for me?
user
Your travelling dates please?
assistant
I am planning to start on 04/09 and return back on 04/11.
user
I am sorry no flights found on your route.
assistant
No issues. Thank you for checking.
user
Thank you for choosing us.
assistant
You are welcome.
user