I'll leave you to work this out. I searched for 4 seats as a Y award figuring there should be a differentiation on this days flights BKK-USM.
The results I got from PG's FB search are that seats are available on the bolded flights.
There were other flights before and after those listed here which also showed availability but for some reason KVS is only showing a subset of the day's flights.
[KVS Availability Tool 7.3.0/Diamond - Availability/FS/US]
Code:
BKK Bangkok Metro / Suvarnabhumi Intl TH = BKK DMK [VTBS]
USM Samui Koh Samui TH [VTSM]
WED 27 Nov 2013
Carrier Flight From Depart To Arrive A/C St Availability
--------- ------ ---- -------- ---- -------- --- -- -----------------------------------
PG 123 BKK 08:15 USM 09:20 319 Y7 M7 K7 N7 T7 L7 H7 Q7 V6
PG 127 BKK 09:00 USM 10:30 AT7 Y7 M0 K0 N0 T0 L0 H0 Q0 V0
PG 805 BKK 09:45 USM 10:50 319 C7 Y7 M7 K0 N0 T0 L0 H0 Q0 V0
PG 125 BKK 10:15 USM 11:45 AT7 Y7 M7 K7 N7 T7 L2 H2 Q2 V1
PG 133 BKK 11:30 USM 12:35 319 C7 Y7 M7 K7 N7 T0 L0 H0 Q0 V0
PG 135 BKK 12:05 USM 13:10 319 Y7 M7 K2 N2 T0 L0 H0 Q0 V0
PG 216 BKK 12:30 USM 14:00 AT7 Y7 M0 K0 N0 T0 L0 H0 Q0 V0
PG 145 BKK 14:00 USM 15:05 319 Y7 M7 K4 N4 T0 L0 H0 Q0 V0
PG 961 BKK 14:45 USM 15:50 319 C7 Y7 M7 K7 N7 T7 L1 H1 Q1 V1 G1 B1
PG 873 BKK 15:35 USM 16:40 319 C7 Y7 M7 K7 N7 T2 L2 H2 Q2 V1
PG 951 BKK 16:10 USM 17:15 319 C7 D7 Y7 M7 K1 N1 T1 L1 H1 Q1 V0
PG 169 BKK 17:00 USM 18:05 319 Y7 M7 K0 N0 T0 L0 H0 Q0 V0
I'm going to hazard a guess that neither C nor Y awards come out of published buckets as I can't fathom that they'd come from a bucket as high as T.