Is this dialogue OK?
Person A. Are you waiting for an invitation?
Person B. No need for an invitation. or No invitation necessary

Question

Is this dialogue OK?
Person A. Are you waiting for an invitation?
Person B. No need for an invitation.  or   No invitation necessary

Answer

Person A. Are you waiting for an invitation?
Person B. I don't think need an invitation.

Are you sure this is the sentence ? It sounds a bit rude.