Hi,.
Hello, how  may I help you?
Owing an emergence, I want to change my existing reservation. Can you help me with it?
Sure, I am here to help you. Can please provide your name?
My name is Thomas Hernandez.
Ok, give me a minute please.
Sure.
Thanks for your time, sorry no reservation found with your name.
Ok, no issues.
Thank you for reaching us, have a nice day.