Hi.
Hello. How may I help you today?
Owing to an emergency, my live concert got postponed, so I want you to change my existing reservation.
Sure, I will help you with that. Can I have  your good name please to check your reservation status?
Sure, Sandra Edwards here.
Ok, please wait a moment.
Sure.
Sorry to inform you that no reservation has found under your name to change.
Ok, no worries at all. Thank you for your assistance.
Thank you for choosing us, have a good day.