Dear [Human Resource Officer],
I am writing to notify you of a harassment that I experienced just recently. I do not want to provide names at the moment. However, I would like to briefly provide you with information on how this incident occurred.
On [date of incident] at [location of incident], I was
[state your activity before the incident occurred]
when I was approached by [a colleague/manager/supervisor/vendor]. [He/she] engaged a conversation with me, which I felt was uncomfortable. Subsequently, [he/she] performed an activity that I regard as highly unprofessional.
I am inexperienced in handling this type of incidence. Thus, I would like to request for time for us to privately discuss this in your office. Please let me know when a good time is.