Hello.
user
Hello. How can I assist you?
assistant
I am Paul Collins, I want to attend science exhibition held at Philadelphia, PA - PHL. Could you please help me in booking a ticket?
user
Ok, please  provide me your journey dates?
assistant
My journey dates are on 12/18 and return on 12/20.
user
Ok, may I know your source point?
assistant
Sure, my source airport is Chicago IL - ORD.
user
Ok, please wait.
assistant
Ok.
user
 Sorry, no flights are available on your requested dates.
assistant
No problem.
user
Thank you for availing us.
assistant
Thank you for your service.
user