what about if your friend who convert to islam then turned to other religion on someone pushing to do so.is it correct.

I am not sure I understand what you mean. Do you mean asking about if it is correct to pray for this one?
I think you can pray for God to guide him/her to the straight Way..

SALAAMU ALAIKUM,

INSHA ALLAH(SWT) I AM UNDERSTANDING YOUR QUESTION AND ALLAH(SWT)KNOWS BEST. BUT IF THE PERSON REVERTED BACK TO ISLAM SINCE WE ARE ALL BORN MUSLIMS THEN ACCEPTED ANOTHER RELIGION OTHER THEN ISLAM THEY ARE CONSIDERED AN APOSTATE AND THERE IS NO DUAA FOR THIS TYPE OF PERSON.