Hello. I am Dennis Lee.
user
Hello, How can I serve you?
assistant
I planned to have a look  Liberty Bell with my children on 12/21, so could you please help me in finding the cheapest flight?
user
Sure, May I know the return date?
assistant
I would like to return on 12/22.
user
Please re verify your journey  dates.
assistant
I would like to start on 12/20 and want to visit the Liberty Bell on 12/21.
user
Please help me with your journey codes.
assistant
My airport codes are IAD and PHL.
user
Please wait a minute.
assistant
Sure.
user
Sorry, No flights found with your chosen dates.
assistant
No problem, thank you for your information.
user
Thank you for opting us.
assistant