Hello.
Hello. How may I aid you today?
I want to change my reservation with new dates. Can you help me with that?
Sure, I am glad to help you with that. Can I know your name to check your previous reservation?
My name is Shirley Perez.
Please wait a moment to check.
Sure.
Thank you for waiting, I have checked in reservation list to change your ticket, but could not find any reservation with your name.
Thank you for the details.
Thank you for reaching us,  hope you have a great day.