Full Idea
Not all sentences using 'if' are conditionals. Consider 'if you want a banana, there is one in the kitchen'. The rough test is that a conditional can be rewritten as 'that A implies that B'.
Gist of Idea
Sentences with 'if' are only conditionals if they can read as A-implies-B
Source
Herbert B. Enderton (A Mathematical Introduction to Logic (2nd) [2001], 1.6.4)
Book Reference
Enderton,Herbert B.: 'A Mathematical Introduction to Logic' [Academic Press 2001], p.10