Hello.
user
Hello. How can I assist you?
assistant
Actually I have planned to travel to Atlanta, but due to some reasons the travel dates has been changed, so I need to change my reservation. Can you help me out?
user
Sure, can I know your name for checking the details?
assistant
Sure, my existing ticket is with name Margaret Allen.
user
Hold on for a minute. I will be back with the details. Sorry to say Allen, I couldn't find any reservation on your  name.
assistant
It's ok, thank you for searching.
user
You are welcome.
assistant