Hi, I am Kathleen Thompson.
Hello Thompson. How can I provide support to you?
I would like lo change my recent existing reservation because  my friend  who is participating is gun shooting  has been postponed.
OK, please wait a moment.
Sure.
I will go through your reservation and update you. We are happy to inform you, we found your reservation. Please share all your travel details for booking?
My  travelling dates are 04/15 and return on 04/17.
Ok, also provide your desired airport abbreviates?
My airport codes are ORD and CLT.
There is a flight in UA airline with price 100 matching your criteria. Shall I make the booking?
You can proceed.
Your booking has been made with flight 1002.
Thank you for booking a ticket.
Thanks for availing our services.