Technology is described for assisting a user in identifying relevant participants to a communication session. The technology detects that the user has interacted with a user interface (UI) presentation in a specified manner. The technology then receives context information that describes the current context of the user's interaction. The technology uses the context information to interrogate a graph to identify one or more candidate participants that may be added to the communication session. The technology then generates a UI collaboration pane for presentation on the UI presentation. The UI collaboration pane provides a mechanism by which the user can add one or more of the candidate participants to the communication session without disrupting the user's focus on a task at hand, and with minimal user interface actions required by the user. Further, the UI collaboration pane gives the user plural options to establish communication with the candidate participants.