沒關係，別擔心。

It's OK, don't worry.

Source: Tatoeba

Sentence Composition

1 沒關係 méiguānxi it doesn't matter
=2 別 Bié surname Bie
=2 別 bié
  1. to leave; to part (from)
  2. (literary) to differentiate; to distinguish
  3. (dialect) to turn away; to turn aside; to avert (one's face, gaze etc)
  4. (bound form) other; another; different
  5. don't ...!
  6. to fasten with a pin or clip
  7. to stick in; to insert (in order to hinder movement)
  8. (noun suffix) category (as in 性别 xìngbié, 派别 pàibié)
3 擔心 dānxīn
  1. anxious
  2. worried
  3. uneasy
  4. to worry
  5. to be anxious