Can I Get 0.7 or 0.8ml of Restylane??

You did not exactly state what you are treating and nor do I see a photo.  I use a 0.8 syringe as a minmum for the majority of things that I do.  The 0.5 is only for minor touch-ups.

Restylane comes in  a 1cc syringe. It can be injected according to what the doctor deems right for the indication. The extra cam always be added somewhere else on the face (there is always one). Another option is to use Juvederm, which comes in 0.8cc syringes. Juvederm is probably a better option for the lips given its soft texture and suppleness. It can swell more than Restylane though and care should be undertaken to not overcorrect.