Hello.
Hello, how may I help you today?
I have to change my reservation due to my planned event got postponed. So please  help me with that.
Sure, I can change your reservation right now. Before that I need to know your good name please?
Thank you. Please check the reservation with my name Dennis Hall.
Please wait a minute.
Sure, take your time.
Sorry to say that, there is no active reservation found on your name.
Oh! It may not be booked properly. Anyway, thank you for your time.
Thank you for opting us.