One of the Promos for The Force Awakens shows R2-D2 and C-3PO meeting BB-8 in a desert, probably Jakku.
Where in the movie was this supposed to go?
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That scene was invented entirely for that promotional clip, and has nothing at all to do with the plot of the movie.
Note that the clip is not a Star Wars: The Force Awakens commercial, as it has sometimes been incorrectly labelled on YouTube. It's a commercial for a UK mobile service provider, O2 as you can see from the quote and clip below.
UK telecommunications services provider O2 has begun airing a new commercial which features our old trusty droid friends R2-D2 and C3PO, who are wandering the desert planet of Jakku in hopes of finding help. And help they find, in the form of BB-8, the new droid from Star Wars: The Force Awakens. The footage does not appear to be from the movie itself src