A strong short (but longer than usual) eye contact when transferring your message: Good tip is to look at the part of the nose between the eyes.
Take a natural pose or stand: Do not cross your arms or legs. If your hands, arms and feet are open and showing, ´´the person will trust you more´´.
The voice is very powerful: The tone of your voice can influence how people look at you. Ever wondered why a person with a soft and friendly tone is more likely to be trusted? A deep, resonant voice with a strong undertone is the voice of a leader, and crowds of people are attracted to undertones. Using your voice with undertones can be learned as a skill and can be adjusted to your personal goals.
Being happy and learning to smile: Ever noticed how a person can be more likeable and trusted after he/she laughed with you? The voice has a nice optimistic vibe, and the whole face smiles! Try to make people laugh first and afterwards, try to ask the thing what you wanted.
Touch the elbow slightly: Touching the elbow slightly can be very efficient, but don't touch it too long! Touch it briefly during the conversation
TOP-5 rules of body language: body hacks to get what you want