Hello, Gregory Adams here.
user
Hello Adams, how can I help you today?
assistant
I want to change my existing reservation, as my exams has postponed suddenly. Can you please help me?
user
Sure, I will help you in changing your reservation. I will check for your reservation details in our website.
assistant
Ok.
user
I have checked it, but there is no reservation under your name.
assistant
Ok, no problem. Thank you for your information.
user
Thank you for choosing us and have a nice day.
assistant