Reading between the lines, I'm deducing that your question is about domains: should you go with the tried and true .com (which would require hyphenating the business name) or take a bit of a risk on the newer .expert?
Those are reasonable questions. But as Humberto points out, they're not the questions you should be asking. The real question is: Why are you opting for a generic name -- which could be used by any expert site, not just yours -- instead of crafting a name that highlights what's distinctive about your offering (live video)?
I recommend that you go back to the beginning and write a detailed naming brief. (See this post for tips: http://nancyfriedman.typepad.com/away_with_words/2011/11/how-to-write-a-naming-brief.html) Then put yourself in your hypothetical user's shoes: what makes your app special, memorable, recommendable? See what vocabulary comes up as a result of these exercises.
If you still need help, schedule a Clarity call to talk about the naming brief and creative directions.
One more thing: "Askan" does not look like "ask an." It looks like the name of a distant planet or a made-up language.