One of the problems I have when I can't stop interracting with people is, I continue to mention them and if they respond the conversation continues.
In the end if they were unable to say anything in regards to stop the conversation...
(regardless of reason, ie. politeness or they find it intimidating to talk to me and that prevents them to say anything)
...then the conversation might go on and on and both parties may lose a lot of time.
That was the longest call I've ever had. Hours and hours passed and none of us were successful at closing the call