Observe your customer's body language to make huge sales.

Watch closely over your prospect and observe their movements.
People shrug their shoulders when indifferent, tap their fingers for impatience, or loosen their collar when they feel uncomfortable.

If they begin to lose interest, change your topic.
Ask them some personal questions or tell them something they may find useful. Take it slow and be patient.

When your prospect looks for a pen or takes the contract in hand, finish your job quickly. Give him the pen quickly and let him sign peacefully.
Don't go on talking about your products.