Leads are slippery as fish; You can miss them within a blink.  Imagine that you have to schedule a meeting with one of your leads via email, who wants to see a trial of your services. You send an email with the next available hour of your availability, but your suggested time is not suitable for. So, he asks for 2 hours later, but it’s when your appointment with another organization is set. You reschedule again and again through emails until both parties settle upon a time or the lead runs away. This hassle and risk was enough, right? Yes, but only if you both concur on a same time. Here’s the 2nd part of the horror story: what if your lead asks you to rearrange the appointment? Also, you lose the credibility if between the chain of meetings an email is read a bit late or time zone difference