Hi. Amanda Hernandez here.
Hello, how may I assist you?
 Due to my health problem I want to change my reservation, can you please help me to change my reservation?
Ok, please allow me to check with your previous reservation for a moment.
Ok.
I am so sorry to inform you, there is no active reservation found by your name in our data base.
That's ok, thank you for your help.
Thank you for reaching our assistance, have a great day ahead.