Hello. I am Stephen Hall.
user
Hello, how may I assist you?
assistant
I need to change my existing reservation due to delay of my project submission. Could you please help me?
user
Sure, please wait for a moment.
assistant
Sure.
user
Sorry, there is no reservation found on your name in our database to change.
assistant
No worries, thank you for the information.
user
You are welcome.
assistant