It may not be wrong to suggest that the consultative sales training Singapore would teach you to find out whether there actually is a need for your service or product. However, it would help you in finding different ways of differentiating yourself from your counterparts. It would be done to build a long-term relationship with their customers.
However, it may not it ensure that you have not been wasting your time. Your main objective should be to determine whether the prospect has really been in a position of buying your service or product. Your time has been deemed of great value. You cannot waste it working with prospects that may not transform into sales.