(1) If you fry (or terminate the contract of )your maid on 1/10, you should buy a ticket (1-way) on 15/10. The maid can change the date of departure but she has to pay some fee to the airline.
(2) Go to Cebu airline (on -line) and choose the cheapest type of ticket (go-lite). You type your name and address and phone no. The guest name is your maid's name. There is no postal code in HK. I remember last time, I typed 852-000.
(3) Then you pay by your credit card.
(4) Print the confirmation letter.
Hope this may help you.