Re: The secretary of the firm need to make an introduction of the company and herself
I believe this to be an American/British cultural difference.
My husband works in retail and it's really disheartening the way some poeple act as though the people taking care of them (whether in a shop, a bank, a restaurant, the garage, etc.) are automatons without any humanity. Sometimes patrons won't even look you in the eye - you exist solely to wait on them. Then there are other people who do recognize that you are, in fact, a fellow member of their species. I don't mean you become best buds, get invited to dinner, or get a Christmas card. But for the time you interact, you are treated as a human. Using the person's name is one way to show you recognize they are a person, not a robot and not your servant. I've watched my husband, time after time, greet the salesperson or counterperson by name (they usually have on a nametag) and have seen the effect it has on the encounter. I do realize that this would be overly famliar in other nations, but in the US, it establishes rapport. "Oh wow! She treats me like I'm a human being."
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.