Hello.
user
Hello, how may I aid you today?
assistant
I would like to change my existing reservation, due to examination schedule postponed. Can you please help me?
user
Sure, may I know your name?
assistant
My name is Matthew Gonzalez.
user
Wait a minute, let me check you reservation and revert you.
assistant
Sure, take your own time.
user
Sorry,  we could not find any reservation on your name.
assistant
That's ok, thank you for your information.
user
Thank you for reaching us.
assistant