Hi.
Hello, how may I serve you today?
Actually I made a earlier reservation to go for a trip with my friends, but heavy work  in office I want to change my reservation. Can you please help me in changing?
Sure, kindly provide your name to check the reservation?
I am Samantha Harris.
We found a reservation on your name, please share your travel details?
OK. My travel dates are from 04/13 to 04/15. DEN to IAH are my airport codes.
Ok, please wait for a while.
Ok.
Sorry, there were no flights found from your source.
Ok, no problem. Thank you for the information.
Thank you for reaching us.