Hello,.
Hello, How may I help you?
Owing to an emergency  I need to change my existing reservation. Can you please help me out with this?
Ok, Can you please provide me your name?
Sure,I am Andrew Carter.
Please wait for a moment, I will get back to you with the information.
Ok.
Thanks for waiting, We did not find a reservation on your name.
Ok. No issue. Thank you for your information.
Thank you, Have a great day.