I had an older E class to start with so can work both platforms here in Liverpool. The car is going up for sale as the executive work we do get doesn't make up for it.
Most passengers I collect, don't talk. They're usually on their phone, or on their laptop, or talking to their companion, if they've got one. They may just want a silent ride, may not like chit chat, etc.
I prefer it that way anyway, better to concentrate on your driving instead.
Also if the conversation turns religious and/or political, you'll have to try and remain neutral, whatever your views are, otherwise it won't be professional.