Hello.
Hello, how can I assist you at this moment?
I would like to change the travel dates in the past ticket because my trip got postponed, can you please help me to do that?
Sure, I am happy to help you with that. Can I have your good name please to check your reservation status?
Thank you for considering my request. My name is John Martin.
Ok, please be on hold for a moment.
Ok, take your own time.
Sorry John Martin, no reservation has found under your name to change.
It's ok, not a problem. Thank you for the information.
Thank you for choosing  us, have a good day.