1. Do you mean: Do you have an appointment please?
2. Can you say: Are you here to see Mr. Smith please?
Yes, that's the idea. I don't mean you have to say 'please' absolutely every time you speak, but you need to establish a polite tone for the conversation.
I can't speak for all Americans, but please and thank you are staples in my family's conversations. At the drive-through, on the phone, at the order counter, at the restaurant, in the bank... definitely please and thank you.
Maybe we are anomolies. Maybe that's why other children's mothers tell me how polite my kids are. But I don't really think so.
Generally, when you want something you say "please." When you get what you want, you say, "thank you."
In the situation you described in an office the man might say, "I' m here to see Mr. Smith, please.
The secretary might say: "Do you have an appointment?" (without the word "here.") The word "please" might be omitted also in this particular part of the di