'Somebody' refers to one unspecified person, and 'everybody' refers to all the people in general or in a specific group.
Make sure to call
We use 'somebody' in positive statements, not in questions.
HOWEVER, we can use 'somebody' in requests and in offers, which are two special categories of questions.
Somebody: in Positive Statements
Somebody: in Request Questions
Somebody: in Offer Questions
Would you like to talk to
We use 'everybody' to refer to all people related to a particular situation or a group. It just depends on the group or the situation.
The particular group in this example is a class.
The particular group in this example is an office.