Hello, Janet Harris here.
Hello Janet. How can I guide you today?
I am stuck in traffic jam, so I will not be able to catch my flight. Could you help me to change my reservation?
Sure, please wait. I will get back to you.
Take your time.
 I have checked and see that there is no reservation found under your name.
No problem, thank you for the information.
Thank you, have a good day.