You have guessed the name of the flower. 😀
The supervisor of the people who take care in the garden told me another name, more likely a nickname of that flower. It was something like dawn-dusk. But its real name is Mirabilis jalapa after I googled it.
The funny story is that at lunch time within a week time, I was walking near the flower waiting to see it blooming. And then two days ago arriving at work early in the morning I saw it in full bloom and just then I understood that it is actually a night flower and shortly after I took few shots it closed again for the rest of the day. 😀