You can ask your bun which date she prefers to have the air-ticket and then ask her to sign it off. Then you can buy the ticket according to the date she signed.
tiger arline is cheapter than cebu airline
now have the promotor until 16.03.11, no need to pay the additional fuel charge, i buy the air ticket from hk to manila (clark airport ) , total charge $260 (air ticket fee $140 + tax $120)