Hello,.
user
Hello. How can I assist you?
assistant
Actually I have planned to attend the client meeting but due to some technical issues the meeting has been postponed. So, I want change my reservation, can you help me?
user
Sure, may I know your good name?
assistant
I am Joseph Walker.
user
 Ok, please wait I will revert  you in  a moment.
assistant
Sure.
user
Thank you for waiting. Sorry to inform you that no reservation was found on your name provided.
assistant
Ok, thanks for providing information.
user
 Thank you for consulting us.
assistant