About hiding/showing buttons with respect to certain conditions mentioned in controlller

Hi All,

I have made a function chat() in my users_controller and I want to add
certain conditions like if a user cancels session before chat starts
than a button should appear naming CANCEL_SESSION.but the moment
session starts that button should dissapear and anothr button naming
end session should appear..How can I achieve these things??I am stuck
at this problem since last 1 day..somebody plz guide ASAP.

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