Hi.
user
Hello, how may I oblige you today?
assistant
Could you help me to amend my existing reservation?
user
Sure, may I know your good name?
assistant
I am Kimberly Williams.
user
 I have checked in reservation list to change your ticket, but could not find any reservation with your name.
assistant
Not a problem, thank you for the information.
user
Thank you for choosing us.
assistant