How to convince a girl to just give a relationship a chance?

what is a good way or how do I convince a girl that I've been spending a lot of time with to give a relationship a chance, to just give it a try. I know sometimes people say they just aren't looking for a relationship right now, but we both care about each other and we aren't seeing anybody else, just really really busy with work and school. but its been long enough, I need to basically tell her, give it a shot and lets try, or we both are going to lose each other... so what's a good way to bring this up in a talk with her and some convincing points/arguments to convince her to give it a shot?
How to convince a girl to just give a relationship a chance?
Post Opinion