cant use Dalaran flight NPC

[Espenenebv]

When i try to interact with the NPC nothing happens, also when im in different places in Northrend the option to fly to Dalaran is not there.

[OhieMitzen]

You might be missing some flight points
http://zam.zamimg.com/images/a/3/a3e...7f36e6a58f.png