Hello, Brian Taylor here.
user
Hello Taylor, how can I assist you today?
assistant
 I want to do some changes in my existing reservation because I did not get the concert tickets, so planning to travel on another date, can you please help me?
user
Sure, I will help you, let me check. Taylor, I have not found any reservation by your name.
assistant
That's ok. Thank you for checking.
user
Thank you for contacting us, have a nice day.
assistant