URGENT!!! some phrases to correct...

Would someone be so kind to corect and improve the following phrases?

A: Aha ok, someone  body else is here. Now I would like to know whether if you are the only person in your department who is entitled to conduct these sort of procedures, Unless,  you have other colleagues that can handle such operations?
B: I used to work alone until half a year ago, the first of October to be precise, a junior employee was hired o support to assist me. She has various tasks to accomplish, but for the most part she assists  helps me.
A: Sorry to interrupt you, but did I understand it  that correctly? She commences activity now?  does she?
B: No. She commenced operations half a year ago.

This is the best I can do to help you. I'm not a grammar wizzard or business man, but I think I could point out some errors here. If anyone would like to correct the *corrections* I made, then go right ahead.

URGENT!!! some phrases to correct...

Would someone be so kind to correct and improve the following phrases?

A: Aha ok, somebody else. Now I would like to know whether you are the only person in your department who is entitled (capable of conducting) to conduct these sort of such procedures, or do you have other colleagues?
B: I used to work alone until half a year ago, the first of October to be precise, a junior employee was hired to support me. She has various tasks to accomplish, but for the most part she just assists me.
A: Sorry to interrupt you, but did I understand it correctly? She has commenced activity work just now, does has she?
B: No. She commenced operations half a year ago.

What is the context of this exchange?

Corrections in red.  Stylistics in blue.

URGENT!!! some phrasesand sentences to correct...    

Would someone be so kind to corect and improve the following phrases and sentences?

A: Aha, ok, somebody else. Now I would like to know whether you are the only person in your department who is entitled to conduct these sorts of procedures, or do you have other colleagues who are also entitled to do so?  [1]
B: I used to work alone until half a year ago, until the first of October to be precise. A junior employee was hired to assist me. She has various tasks to accomplish, but for the most part she assists me.
A: Sorry to interrupt you, but did I understand you correctly? She's commencing her activities now, correct?
B: No. She commenced her activities six months ago. [2]

[1]  I don't think you want to ask merely if the person has colleagues.  What I think you want to ask is if he or she has colleagues who are also entitled to conduct these sorts of procedures.

[2]  "half a year ago" is not incorrect, but where a Russian might naturally use полгода, and English-speaker is more likely to use "six months ago".