During Chanukah and Purim, if one forgets to say Al HaNissim during Amidah or Birchas HaMazon in its usual place, the paragraph of Bemei Mordechai or Bemei Mattisyahu is said later on. In this case, the introductory lines of Al HaNissim are replaced with this text:
הרחמן הוא יעשה לנו ניסים ונפלאות כמו שעשה לאבותינו בימים ההם בזמן הזה
May the Merciful One perform miracles and wonders for us, just as He did for our ancestors in those days at this time.
In shul this morning, someone stumped me with this question: Why are we asking God for miracles? Do we ever explicitly request “nissim v’nifla’os” at any other time in tefilla?