I work in one branch of a business and she works in another. Most of her colleagues and she knows that i work in this other branch.

Ive said hi and smiled at her a few times and shes smiled back. we've started talking a little bit (like how are you, have a good easter and she asked me about work) and the other day she said that she recognised me when she was down the town.

i fancy her but ive never got round to asking her what her name is

How should i ask her out and when is the best time to do so.