Assolutamente as a self-sufficient adverb is an expression that has seeped into the Italian language through media exposure.
Example 1:- Marco, sei sicuro di aver detto ai tuoi genitori che partiamo domani?
- Assolutamente sì!
- Marco, are you sure you told your parents that we are leaving tomorrow?
Example 2:- Pranziamo al ristorante cinese, oggi?
- Are we having lunch at the Chinese restaurant today?