I am flying to Mongol tomorrow.

The CEO is now trying to establish a Mongol office with this friend.
I'm going to interview some candidates for the new office member in Mongol.

I'm looking forward to meeting the new candidates.

Notes:

    - 'I will' indicates a recent decision. I assume this trip was planned beforehand. Here I replaced it with the present-tense 'I am flying" which makes your statement more certain.

- 'a' - you need the article 'a' before 'Mongol Office'. This is because 'office' is singular noun, there is only one. You use 'a' instead of 'an' because the next word 'Mongol' begins with a consonant sound.
   

 - 'right now' - 'right now' means 'at the present time' but does make it indefinite. Mongol is very cold right now but this will eventually change. 'these days'  is does not indicate that the cold will end anytime soon.

    - I connected the next sentence beginning with 'so' to the previous sentence. This is because the second sentence was subordinate to the first. The cold caused you to gather warm clothes.

    - 'their university' - 'the' is not appropriate because you did not establish the existence of this university previously.

    - 'candidates' is plural because the interview process needs more than one.

Feel free to ask questions!