this is how the NZ CAA would have you do it Staright from AC91-9
PQR TRAFFIC 2 O’CLOCK 5 MILES NORTHBOUND CHEROKEE AT 2000 FEET
-PQR LOOKING
PQR IF NO SIGHTING SUGGEST TURN LEFT 60 DEGREES
-PQR TRAFFIC IN SIGHT
PQR ROGER
Or
FASTAIR 345 UNKNOWN TRAFFIC 1 O’CLOCK 3 MILES OPPOSITE DIRECTION FAST MOVING
-FASTAIR 345 LOOKING ... FASTAIR 345 TRAFFIC IN SIGHT NOW PASSED CLEARED
As long as you tell them you are looking and do or do not have the traffic in sight thats safe.