We have used sound proofing methods twice for similar reasons. The problem is, no matter what you spend or do, you will struggle to make much impact. As one professional explained to me, noise is just like water. If you totally sound proof your flow the noise finds a way to seep down the sides of the wall etc. If the specific noise problem is footfall then of course rugs etc soften thins but if it's talking etc the headphones might be the only real option. However, if you wanted to proceed (we did, despite the above, thinking any little surely helps" then you could lift your laminate and use a sound proofing underlay which you can mum fairly reasonably online. Good luck.