Content could be anything - it's tone you need to crack, not what to talk about. Partners at MC firms are much like the business leaders of any sizeable business - conscious of time/effort economy and conscious practitioners of clear, concise, to the point communication. It doesn't matter what the small talk is, what matters is the way you deliver it - confident, articulate, to the point and relevant. Plenty of news on here to start with - a simple 'what do you make of the Booz acquisition by PwC?' for example.