Hi.
user
Hello. How can I aid you today?
assistant
I am David Davis want to visit Houston, can you book a ticket from DCA to HOU?
user
Sure, I am here to help you with that, May I know your travelling dates?
assistant
Sure, my travelling dates will be 03/05 and 03/07.
user
Ok, wait for a minute. Sorry to say that, there are no flight's available based on your travelling dates.
assistant
Ok.\. That's ok, thank you.
user
Thank you for reaching us.
assistant