Hello.
user
Hello, May I know your good name?
assistant
Sure, Richard Wilson here.
user
How can I support you today?
assistant
I want to change my existing reservation, due to postpone of my exam. So, Can you please help me to change  my reservation?
user
Sure, we are here to help you for changing.
assistant
Thank you.
user
Please give me a minute, I will check with the reservation on your name and revert to you.
assistant
Sure.
user
Thank you for waiting, we did not find any reservation on your name to change it.
assistant
No problem, thanks for your help.
user
Thank you for choosing us.
assistant