Hi.
Hello.
I am Charles Edwards.
How may I guide you today?
I need to change my existing reservation as my exams got postponed, Can you please help me with that?
Sure, I will help you with that.
Thank you.
Please wait for a  minute, I will get back to you.
Sure.
I am sorry to say that there is no reservation found under your name.
Ok, no problem.
Thank you for reaching us, have a great day.