Hello.
Hello, how may I help you?
I need to change my reservation due to my planned event got postponed. So please help me with that.
Sure, we are here to help you.
Thank you for accepting my request.
May I know your name please?
Sure,  myself James Jackson.
Sorry to inform you that there is no active reservation on your given name.
Oh! It may  not be booked properly while booking. Anyway, thank you for your time.
Thanks for contacting us.