Hello.
user
Hello, how can I assist you at this moment?
assistant
I am George Scott. My bank exams got postpone so I need to change my existing reservation. Can you help me to change please?
user
Sure, I am glad to help you. Please wait for some time, we will check with your recent reservation  and give you an update.
assistant
Sure.
user
Thank you for waiting, there is no reservation found on your name.
assistant
Ok, no problem. Thanks for your information.
user
Thank you for reaching us. have a good day.
assistant