I try to hide the UI for UCC and UIS if the ability converse is started. For UCC it is really easy (tick it). However, for UIS I don't know, how do to it in a "good" way. For the ability converse I use the Dialogue System from Pixel Crushers.
Did you also download the Dialogue System integration with UIS?
Pixel Crushers are the ones managing that integration so feel free to contact them for more support on this.