Why a friendly opening sounds wrong in a formal setting
Every greeting also announces how close you think you are to the other person, which is why a warm one can misfire.
Good morning, I'm Ana Ruiz and I have an interview with Mrs Hale at ten.
Every English greeting carries a second message underneath the first. On the surface it says you have noticed the other person; underneath it announces how close you believe the two of you are. In a room where you have met nobody yet, a reception desk, a job interview, a first day, you have no standing to announce closeness, so the safe choice is the neutral, slightly long opening: the time-of-day form, your full name, and the reason you are there. The model sentence does all three in one breath, which is why it survives almost any formal room.
The error is opening a formal encounter with a street greeting: the short casual question friends toss at each other in passing, the one with a rising tone that nobody actually answers. It is tempting for an honest reason, because it is the form learners hear most in films and songs, so it feels like the warm, natural choice. At a reception desk it is not heard as warm; it is heard as someone who has not noticed where they are standing, and the person behind the desk quietly adjusts their expectations. The opposite slip costs less but still lands oddly: the full three-part introduction from the model sentence, delivered to people who already know you, sounds stiff, and can even be heard as teasing. Choose for the room, not for your mood.