Hi.
Hello, how may I oblige you today?
Could you please change my existing reservation?
Sure, I can change your reservation right now. Before that I need to know your good name please?
I am Scott Edwards.
 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.
No problem, thank you.
Thank you for choosing us.