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