Protests as Greeks MPs debate Macedonia deal

The transcript contains a brief statement indicating that something is not a big deal.

What does the phrase 'No big deal' imply in a conversation?

In what contexts might someone use the phrase 'Yeah. No big deal.'?

How can the tone of voice affect the meaning of 'Yeah. No big deal.'?

What emotions might be conveyed by saying 'No big deal'?

Can 'Yeah. No big deal.' be interpreted differently based on the situation? Explain.