['I am all alone as well.  Everyone is gone for their summer vacations.', "That sucks.  It's the same for me, only it's because we recently moved and I don't know anyone outside of work yet.", 'Wife and kids went to see family and my friends went hunting without me.']
Ouch.  Were you too busy to go with them?
I am home all alone today.  Everyone is gone on vacation including my close friends.