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##Javascript, 114 96 86 84 bytes

a=>b=>{c=b.length;for(x=0;x<c;x++)for( y=x;++y<c;)if(b[x]+b[y]==a)return[b[x],b[y]]} 

Saved 1 byte thanks to @Cyoce and another 8 bytes thanks to @ETHProductions

This returns a tuple with the first combination of list-elements that sum up to the given input, or nothing for no match. I've removed the vars in the function; REPL.it crashes without them, but the Chrome Dev Console handles this just fine...

Try it online!

Javascript, 114 96 86 84 bytes

a=>b=>{c=b.length;for(x=0;x<c;x++)for( y=x;++y<c;)if(b[x]+b[y]==a)return[b[x],b[y]]} 

Saved 1 byte thanks to @Cyoce and another 8 bytes thanks to @ETHProductions

This returns a tuple with the first combination of list-elements that sum up to the given input, or nothing for no match. I've removed the vars in the function; REPL.it crashes without them, but the Chrome Dev Console handles this just fine...

Try it online!

##Javascript, 114 96 86 bytes

a=>b=>{for(x=0;x<b.length;x++)for(y=x;++y<b.length;)if(b[x]+b[y]==a)return[b[x],b[y]]} 

Saved 1 byte thanks to @Cyoce and another 8 bytes thanks to @ETHProductions

This returns a tuple with the first combination of list-elements that sum up to the given input, or nothing for no match. I've removed the vars in the function; REPL.it crashes without them, but the Chrome Dev Console handles this just fine...

Try it online!

##Javascript, 114 96 86 84 bytes

a=>b=>{c=b.length;for(x=0;x<c;x++)for( y=x;++y<c;)if(b[x]+b[y]==a)return[b[x],b[y]]} 

Saved 1 byte thanks to @Cyoce and another 8 bytes thanks to @ETHProductions

This returns a tuple with the first combination of list-elements that sum up to the given input, or nothing for no match. I've removed the vars in the function; REPL.it crashes without them, but the Chrome Dev Console handles this just fine...

Try it online!

##Javascript, 114 96 bytes

a=>b=>{for(x=0;x<b.length;x++){for(y=x+1;y<b.length;y++){if(b[x]+b[y]==a){return [b[x],b[y]]}}}} 

Saved 1 byte thanks to @Cyoce

This returns a tuple with the first combination of list-elements that sum up to the given input, or nothing for no match. I've removed the vars in the function; REPL.it crashes without them, but the Chrome Dev Console handles this just fine...

Try it online!

##Javascript, 114 96 86 bytes

a=>b=>{for(x=0;x<b.length;x++)for(y=x;++y<b.length;)if(b[x]+b[y]==a)return[b[x],b[y]]} 

Saved 1 byte thanks to @Cyoce and another 8 bytes thanks to @ETHProductions

This returns a tuple with the first combination of list-elements that sum up to the given input, or nothing for no match. I've removed the vars in the function; REPL.it crashes without them, but the Chrome Dev Console handles this just fine...

Try it online!