Hi.
user
Hello. How may I help you?
assistant
Could you please change my existing reservation due to postpone of my exams?
user
 Sure, can I know your name?
assistant
My name is Scott Nelson.
user
Please wait a moment.
assistant
Sure.
user
Sorry, there are no active reservations on your name to change.
assistant
Not a problem, thank you for checking.
user
Thank you for reaching our service.
assistant