C award with segments on two-cabin service aircrafts
My younger brother is going to book a TPAC business class award. He could find C inventory on most of the segments except the SFO-PHX and PHX-DFW segments, which are on the US metal with only F and Y (both have award inventory available). It is his first time to book an award ticket and I don't have such experience on US. So I would like to request your advice on this. What should he do? Would the reservation agent give him F seats on these two segments without pulling extra miles above the regular business class award?
Thanks!