Hi.
Hello, how may I help you today?
Charles Hernandez  here, due to sudden changes my exams has been postponed.
Sure, I will help you.
Can you please help me with changing my reservation.
Please wait for a while.
Ok.
Thanks for waiting, we found a new reservation on your given name. Can you please help me with your new journey details?
OK. My travel dates are 08/23 and 08/25. Airport codes are SFO-OAK.
Sorry, there is no flights found on your given details.