Hello,.
user
Hello. How can I  help you?
assistant
I am Mary Johnson. I made a earlier reservation to attend for auditions, due to some technical issues it got postponed. Can you please change my existing reservation?
user
Sure, just a moment please.
assistant
Sure.
user
I am sorry no reservation found on your name.
assistant
Ok, no issue.
user
Thank you for choosing us.
assistant
Thank you.
user