Hi. I am Richard Walker.
user
Hello, how can I help you today?
assistant
 I want to change my recent reservation as my joining date got postponed. Can you help me in changing?
user
Sure, please wait for a moment.
assistant
Ok.
user
Sorry, there was no reservation found with your name.
assistant
ok, no issues. Thanks for the help.
user
Thank you for opting us.
assistant