Hello.
Hello, how may I render you today?
Can you help me to change my recent reservation because  my trip dates are got postponed?
Sure, may I know your good name?
I am Christopher Parker.
Ok, please wait for a while.
Sure, take your own time.
I have checked in reservation list to change your ticket, but could not find any reservation with your name.
That's ok, thank you for checking.
Thank you for choosing us.