Hello.
Hello. How may I help you?
Due to inconvenience of  my work, I want to change my reservation. Can you please help me for that?
Sure. May I know your name please?
My name is Ruth Gonzalez.
Wait for a moment please.
Ok, I will wait.
Thanks for waiting.
My pleasure.
Sorry to inform you that I have not found your flight reservation to change it.
Anyway, thanks for the information.
Thank you.