Hello.
Hello, how can I serve you the best today?
Can you please help me to change my existing reservation?
Sure, I can change your reservation right now. Before that I need to know your good name please?
I am Donald Baker.
 Thank you. Please stay online for a while, I will check your reservation status and let you know.
Sure.
Sorry to say that, there is no active reservation found on your name.
Ok, not an issue. Thank you for checking.
Thank you for opting us.