Sentences of a paragraph are given below. While the first and the last sentences (S1 and S6) are in the correct order, the sentences in between are jumbled up. Arrange the sentences in the correct order to form a meaningful and coherent paragraph.

S1. Under normal conditions
A. talk of nothing in particular
B. he would welcome us with a smile
C. crack a joke or two
D. for a couple of minutes
S6. and then state the actual business.