a istance in a sentence

1. H : ( operator ) george ' s hotel . can be of any a istance
2. If no re iratio are detected , call for a istance
3. While no one likes the shirker who never seems to be able to quite get his own projects finished and tur helple ly to peers for a istance , most will willingly volunteer to lend a hand to someone who has helped him or her
4. It's difficult to find a istance in a sentence.