Hello, I am Melissa Gonzalez.
user
Hello. How can I aid you?
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.
assistant
Ok.
user
 Sorry, there is no reservation found on your name.
assistant
Ok, no issues. Thank you.
user
Thank you.
assistant