Hello,.
Hello.
I am Ryan Anderson.
How can I serve you today?
I want to change my existing reservation due to postpone of my exams so, can you help me with changing  my reservation?
Sure, I am here to help you.
Thank you.
Please, wait.
Sure.
Thank you for being patience, there is no reservation found on your name.
No problem, thank you for the information.
Thank you for availing us.