Hi. I am Nicholas Martin.
user
Hello, how can I assist you for the day?
assistant
 I just want to change an existing reservation as my meeting got post pone due to some technical issues. Can you help me?
user
Sure, I am here to help you.
assistant
Thank you.
user
Please wait for a moment.
assistant
Ok.
user
Sorry, we found no reservation on your given name.
assistant
No issue. Thank you for the information.
user
Thank you for reaching us.
assistant