Hello,.
Hello,. How can I oblige you today?
Please change my existing reservation owing to an emergency.
Sure, we here to aid you. Let me know your name for checking the reservation.
I am Michael Perez.
Please stay online, I will check the reservation list whether your name is there or not.
Sure.
Thanks for your valuable time,  we did not find any reservation with your name Michael Perez in our database.
Thank you.
Thank you for reaching us.