Hi. Frank Lewis here.
user
Hello, how can I help you Lewis?
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
Ok. Please wait for a while.
assistant
Ok.
user
Sorry Lewis, no reservation found under your name?
assistant
It's ok. Thank you.
user
Welcome.
assistant