Search interaction

A search feature silimar to "from:"

User would search "interaction:" or some key word

You could put a power to so like "Interaction:<user>4" would search for interactions with the user where you messaged then the user messaged between 4 messages

so 
an example would be in a server
you
user1
user2
<user> 

im trying to find a interaction i had with someone but im unsure theres the right tools to do if this already exists can someone help?