Hello. I am Kevin Williams.
user
Hello. How can I help you?
assistant
I would like to change my recent reservation because my brother marriage was postponed, can you help me?
user
Sure, let me check your reservation status  in our database.
assistant
Ok, take your own time.
user
Sorry, I did not find any flights for you. Sorry, I did not find any reservation by your name.
assistant
That's ok, thank you for checking.
user