Hello. I am David Thomas.
user
Hello, how may I help you at this moment?
assistant
I need to change my existing reservation, as my exam scheduled has been postponed. Please help me in changing?
user
Sure, please wait for a while.
assistant
OK.
user
Sorry, we couldn't find any reservation on your name.
assistant
Ok, no issues. Thank you for your help.
user
Thank you for reaching us.
assistant