Hello.
Hello. How can I help you today?
I am Cynthia Edwards. I am planning to change an existing reservation, due to some urgent work. Can you please change my ticket?
Ok, give me a moment to check with your reservation.
Sure,  I will wait.
So sorry to inform you, there is no reservation found in our data base by the name of Cynthia Edwards.
That's fine.
Thank you for reaching us for your help.
Thank you for your service.
Most welcome.