A father takes his son to the emergency section hurriedly and asks the receptionist: Do you have a vacant bed to admit / hospitalize my son?
Do the underlined parts sound natural and common?
No. For a start, you don't ask to have someone admitted or hospitalised. You take your child to the Emergency department and simply wait to be seen by a doctor. The doctor decides whether or not you are hospitalised.
I think the following would be a far more likely scenario:
A father rushes his son to the Emergency department of the local hospital and waits to be seen. He hopes that his son is not so ill that he has to be admitted.
Thanks.
Is ''vacant bed'' ok or ''vacant room? or maybe something else? (when we are talking about hospitals)
And is that person who works in the hospital ''a receptionist"?
You can say a vacant bed/room.
And yes the person who works in a hospital is called receptionist.
Hope it helps