Bois and of course Ladies, where I can get some flowers?

I was thinking to ask the woman I like on a date(yes she knows I like her). If she says yes I was thinking about picking her from her office greet her with some flowers (Sunflower?) go have some good time and drop back. All this on foot, because I know a nearby place. Anyways where can I get flowers that will do justice to this amazing woman? I honestly where in Kochi just get me the best place. Thank you in advance....