Hi, I am John Hall.
user
Hello, how can I provide assistance to you?
assistant
I have a plan to travel to Chicago for attending a meeting in my head office but that meeting got postponed, so  please consider my request to change my reservation.
user
Ok, please wait a moment I will check and get back to you.
assistant
Sure.
user
Sorry to say, no reservation found with your name.
assistant
Fine, thank you.
user
Thanks for reaching us, have a good day.
assistant