Panicking and fretting about it won't help protect you from catching it. Careful hygiene and avoiding sick people will
People talking about it a lot is not 'panicking and fretting'. It's great that you can reassure your daughters for now, but you might want to plan for how you talk to them if it does get a lot closer to you. There's a good chance it will, and then it being around will be the new 'normal'. Reassuring them by saying this will never happen is fine in the short-term but doesn't give them any resilience for if it does happen.
Also, if you can introduce the extra hygiene precautions early in a matter of fact way now, then they will have time to become habits for the whole family (washing hands as soon as you come home, for instance, or making it a rule that only parents touch door handles and handrails when out - small kids hold parents hands instead). If they can be habits before the virus is widespread locally, then your kids will be better protected when that happens. You don't have to present it as "do this or we dieeee" - just as an important new habit everyone is starting to do. The bonus is you'll miss more ordinary bugs in the meantime.
From www.theguardian.com/world/2020/feb/13/coronavirus-medical-chief-says-uk-hopes-to-delay-any-outbreak-until-summer - the Chief Medical Officer speaking:
"Whitty said that people in the UK should not be changing their behaviour but taking sensible precautions to avoid getting any virus, such as covering their mouths with a handkerchief or tissue when sneezing or coughing and throwing used tissues away safely."
I wanted to shout at the screen when I read that, because taking sensible precautions is a huge change in behaviour for many people. Loads of people just don't bother, even though they know about flu and know that vulnerable people could die. They just don't really care, or think it matters to them personally, so they don't bother.
I would like to see the message from the government being much blunter - basically saying that we know lots of you don't bother to follow the precautions we urge you all to use every year against flu - well you need to change your behaviour right now if we're going to slow the spread of this new disease.
And then, if we all do change our behaviour fast enough, it might actually make a difference.