Hi.
Hello, how can I help you at present?
Could you please change my existing reservation due to postpone of my trip?
Sure, I can change your reservation right now. Before that I need to know your good name please?
I am Charles White.
 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.