When we pray, we include prayer requests friends have shared with us.  There are countless other needs which are never mentioned that Spirit prompted eyes will see.  Let your spirit be tuned to the Holy Spirit.  Travel around with the Spirit seeking to pray for a person or situation at His promptings.  We may be aimless, but He never is.  He knows why He leads us into intercession.  In all situations, He always knows the will of God.  Pray with Him.

“We do not know what we ought to pray for, but the Spirit … intercedes for the saints in accordance with God’s will.” Romans 8:26-27 (NIV)

From “In The Steps of The Shepherd”, by H. Lamar Smith