Hello, Rebecca Taylor here.
user
Hello Taylor.
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, give me a minute.
assistant
Ok, take your own time.
user
Sorry Taylor, I couldn't find any reservation on your name.
assistant
That's ok. Thank you for checking.
user
You are welcome.
assistant