Hello.
user
Hello. How can I help you now?
assistant
Due to sudden change in my schedule, I'll like to change my existing reservation. Can you guide me in that?
user
Ok, may I know your name please?
assistant
Myself  Janet Parez.
user
Sorry, there is no reservation found on your name.
assistant
Ok, that's fine. Thanks for assisting me.
user
Thank you for approaching us, have a nice day.
assistant