Hi.
Hello, how can I help you today?
Owing to an emergency, my business conference got postponed, so I want you to change my existing reservation.
Sure, I am here to help you with that. Can you please share me your name?
Sure, William White here.
Please wait a moment.
Sure.
Sorry, there is no active reservation found on  your name.
Ok, no worries at all. Thank you for your assistance.
Thank you for reaching us, have a nice day.