Hi.
Hello.
I am Lisa Harris.
How can I help you?
 I want to change my recent reservation as my joining date got postponed. Can you help me in changing?
Sure, I am here to help you. Please stand by.
Ok.
Thank you for waiting. Sorry to say no reservation found on your name.
Ok, no issues. Thanks for the help.
Thank you for reaching us, have  a nice day.