I would say to you the same that <a ui-sref="user({id:comment.commenter_obj.id})" href="https://www.italki.com/user/3972616" style="background-color: rgb(255, 255, 255); outline: 0px; color: rgb(8, 82, 148);">Vince Hendricks</a> said already. You have to be patient! It takes time. Read their profile information. I always recommend that. It's pretty easy to do. If you do that you can know some information which can be helpful to you. It can help you to don't waste time sending messages to people that are not interested in languages exchanges with non-native speakers, and so on. For instance, I have that information on my profile. If you sent me a message, I wouldn't reply it because I'm not learning Persian (Farsi) and I don't want to work with English learners. I'm sorry if the last example sounds unkind, but it is just to let you know the best way to find partners, what you have to do to use better your time here, and have a better experience.
Good luck!
Dear Amir and Tania, here's an idea for you: why don't you write an article about learning Farsi? Perhaps comparing it with English? Perhaps highlighting some of its most interesting points? Because although Iran is one of the countries I would most like to visit some day, and even though all of the Iranians I have ever met were incredibly well-educated, polite and friendly people, I've never yet considered learning Farsi. Probably because your language seems terribly intimidating to me and I'm afraid of having yet another un-speakable, un-learnable language on my hands (besides Polish).
Also, the more visible you are on italki, the more people you get into contact with, and the higher the possibilities of finding a language partner. Which is basically hard work - for everyone. :)