You can easily search through your conversation content by using the Find keyboard shortcut in Front, just as you would in other documents and webpages. The search also includes your comments. 

This feature is distinct from the actual Search bar at the top of Front, which is explained here.

Press Command + F for Mac, or CTRL + F for Windows, and type in your search term in the Find box.

The search will look through the conversation you are viewing and highlights all matches. You can navigate between matches using the up and down arrows or using the Return (Mac) or Enter (Windows) key on your keyboard.