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