I have a decent number of SriLankan miles, accumulated through several business class trips to London from either Singapore or Bangkok, that will expire at the end of 2016. I live in Singapore but work in Manila so I want to spend them on Cathay flights in and out of Hong Kong, from either of the aforementioned locations. Despite contacting both SriLankan and Cathay, I have yet to receive a response. Is there any way of redeeming online or do I need to visit the Cathay (or Sri Lankan) service office?

Thanks