Like other questions posted here, this one is for your LOR.
There are also other particulars that could matter, such as the particular work environment, how much inter-employee contact there is in the course of work, the ages of those involved, if the informal meetings are one-on-one or more than that, and much more.
Generally speaking, however, I would humbly but strongly suggest that we consider the Torah’s attitude of harchaka (lo sikrivu liGalos erva as opposed to lo sigalu erva) and the potential danger of, besides for the aveiros chamuros that could result, the resultant (and needless) destruction of one or more families as a result of extra-marital activity, CH”V.
I’m sure that use of the term “Mrs. x” is a very worthy option to consider with your LOR, regardless of industry.