She's gone to arrange dinner party for her in-laws. --*Correct sentence~ ^^ 

It would work if there weren't any problems in this code.  --*Correct sentence~ ^^ 

We guarantee quick exchange and refund. 

Better say: We guarantee a quick exchange and refund.

Our company's facilities is the best all over the world.

Better say: Our company has the best facilities in the world. 

Let's grab a beer after work out. 

Better say: Let's grab a beer after the work out. 

I ocationally have office lunch with other companies' employees.

Better say: I occasionally have office lunches with employees from different companies.

Just be satisfied that given an hour to you. I only have twenty minutes left.

Better say: Simply be satisfied with the hour that has been provided to you. I only have 20 minutes left.

I guess the president organizes a new department.--*Correct sentence~ ^^ 

All of the conference rooms were booked. --*Correct sentence~ ^^ 

One minute and counting! Hurry up! --*Correct sentence~ ^^ 

Are there any objections or does everyone agree it?

Better say: Are there any objections, or does everyone agree?

I never please my boss standard.

Better say: I never meet my boss's standards.