Hello.
Hello, how can I help you today?
 I made a reservation earlier to give a seminar but due to some technical issues, I need to change my reservation. Can you help me in that?
Sure, we will help you. May I know your name please?
I am Kathleen Carter.
Ok, can you please wait for a moment, I will check with your reservation.
Sure, I will wait.
Thank you for waiting. Sorry we couldn't find any reservation on your name.
Ok, no issue.
Thank you for reaching us. Have a good day.