Hello.
Hello, How exactly I can serve you the best today?
I would like to change my existing reservation, can you help me in doing that?
 Sure, I am here to assist you.
Thank you.
Let me know your name to check your reservation?
I am Elizabeth Evans.
Ok, please wait a moment.
Sure, take your time.
Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.
Ok, no issues. Thank you for checking.
Thank you for choosing us.