Hi.
user
Hello. How may I aid you?
assistant
I am Mary Miller, can you help me to book a flight from IAD to DFW?
user
 May I know your preferable journey timings?
assistant
My travelling dates are 10/01 and 10/03. I want to return at afternoon time.
user
Sorry, no flight is available for you as per your requests.
assistant
No issues, thank you for your time.
user
Thanks for choosing us.
assistant