Hi.
user
Hello, how can I help you?
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
Yes, I am here to help you. May I know your name please?
assistant
Thank you.
user
Ok, please wait a minute.
assistant
Sure, Mark Lewis.
user
Thank you for your time, sorry no reservation found on your name.
assistant
No issue.
user
Thank you for reaching us, have  a nice day.
assistant
Thank you for the information.
user