Hello. I am Margaret Smith.
user
Hello, how may I aid you?
assistant
 Could you please check for a cheaper flight within price 500 in my route to Washington, DC-DCA and book me a flight ticket from Denver, CO-DEN?
user
Sure, we are happy to help you. May I know your travelling dates?
assistant
Sure, I would like to start my journey on 01/29 and end my journey on 01/31.
user
Ok, please wait for a while.
assistant
Sure.
user
Thank you for your patience, There were no flights found with your given details.
assistant
No worries, I will choose another alternative to reach my destination. Thank you for the information.
user
Thank you for choosing us.
assistant