Employee name change on runtime

Hello my name is Nishet. i making a hr bot and i find 1 issue. my problem is here: If user x is tell change employee name and then after that rasa bot automatically change employee name in database. i have google excel sheet for database.I see that problem is may be solve using slot but i don’t know how to do that and also i have two slot old_name and new_name that time bot confuse which name it take for change because most of nlu.md data same for new_name and old_name intent.i check all the resource but not too much find anything.can anyone tell me how to do it?please help .Thanks in advance.