Blind transfer vs. consultative transfer

I have 2 doubts, both concernig call transfer: 1) if I try to transfer a call to a destination and this destination DOES NOT ANSWER, how do I retrieve this call back so that I can try to transfer it to another destination? 2) if I try to transfer a call to a destination and this destination is BUSYl, how do I retrieve this call back so that I can try to transfer it to another destination?