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Re:Bots won't replace apps, only better apps will replace apps by tuyguntn on Sunday April 24, 2016 @12:23PM (#11560219)
Have you tried Telegram bots with inline feature supported? It does exactly same thing you have described. (but not ordering pizza yet)

At any one-o-one chat or group chat type:

@gif happy minions -> shows gifs

@youtube js talk -> find relevant videos and select one to send to chat

and so on

Re:Bots won't replace apps, only better apps will replace apps by detaro on Sunday April 24, 2016 @12:26PM (#11560234)
So you still have to name the bot you want, vs the system figuring out which bot(s) are able to handle your request, which the parent post seems to suggest.