First of all, get organised
Another problem we often come across in our day-to-day email exchanges is organising a meeting, whether it be face-to-face or remote. This applies both in one-on-one conversations and also in collective emails when the whole team is lined up in the cc field like a football team before the starting whistle. Whenever somebody new joins the conversation, the difficulties involved in organising the meeting increase disproportionately. But if we feel overpowered, we might find ourselves we end up writing vague, ineffective messages like ‘When would you prefer?’ or ‘You choose’. Although at first glance it might seem polite, in actual fact we are slowing down the whole process because we are not giving ourselves an option first. On the other hand, if we act assertively (‘Choose between these two time slots’), at least one of our recipients is likely to accept our proposal. If those dates are incompatible with other commitments, somebody can still make a counter proposal.