Hi.
user
Hello, how can I help you today?
assistant
I am Emily Martinez. I need a direct flight in my journey, can you be my helping hand in booking?
user
Sure, kindly mention your airport codes?
assistant
I want to attend my convocation at University of Texas, Austin. My airport codes are from IAD to AUS.
user
In which dates do you like to travel?
assistant
My journey dates are from 10/24 to 10/26.
user
Ok, please wait a moment.
assistant
Make sure that my price limit should not exceed 500.
user
Sorry to say, no flight found with your requirement. Thanks for opting us, have  a good day.
assistant