HOW TO MOVE A OBJECT TO ANOTHER OBJECT SMOOTHLY NOT INSTANTLY?

HI GUYS! ok I want to know how to move an object to another object smoothly, as if im throwing it the other object.

Say I have Object A and Object B.

I want, if I click Object B, then Object A will smoothly go to Object B.

I did this:

using UnityEngine; using System.Collections;

public class GreenEnvelope : MonoBehaviour { void Update() { GreenMail(); } private void GreenMail() { //the speed, in units per second, we want to move towards the target float speed = 40; float rotateSpeed = 100f; //move towards the center of the world (or where ever you like) Vector3 targetPosition = new Vector3(-23.77f, -9.719998f, 0); Vector3 currentPosition = this.transform.position; //first, check to see if we're close enough to the target

      if (Vector3.Distance(currentPosition, targetPosition) > .1f)
      {
          Vector3 directionOfTravel = targetPosition - currentPosition;
          //now normalize the direction, since we only want the direction information
          directionOfTravel.Normalize();
          //scale the movement on each axis by the directionOfTravel vector components
          this.transform.Translate(
              (directionOfTravel.x * speed * Time.deltaTime),
              (directionOfTravel.y * speed * Time.deltaTime),
              (directionOfTravel.z * speed * Time.deltaTime),
              Space.World);
          transform.Rotate(Vector3.up, rotateSpeed * Time.deltaTime);
      }

} } but I have to keep clicking the object in order for it to move... I have to keep clicking it everyFrame... thats not what I want. I want to click my "Object B" just once, and my "Object A" will just smoothly go to "Object B"

Please Help! :(