dear Iang Ting:

I think it will be unwise to tell her that you are interested in her as a girlfriend because she works in your office, and if you tell her that, it can create a very uncomfortable situation at work, for you and for her. Better prevent such a situation than having to deal with it later.

If you were not co workers, that would be a different story, somewhat.Being co workers makes it clear to me that it is not a good idea.

It seems like she doesn’t have an interest in having a dating, girlfriend-boyfriend relationship with you. Quite obvious. So, if I was you, the most I would aim at with her is a friendship of the kind that is appropriate for co workers, so that work is not interrupted or compromised as a result.

anita