Business Visa - B1

I applied for B1 Visa to attend Training and my interview was scheduled on April 20 11:30 AM. I went 45 Mins early (10:45). I dint took wallet, mobile phone or anything else apart from Visa Documents. There are no secured locker available to keep things(some local shop helps to keep which i didn't prefer).
I went through security check and bio metric verification completed at 11:05. Then i was standing in the queue for the Interview.

VO: Waved his hand
Me: Good Morning!

VO: Passport pls
Me: Sure (Handed over passport)

VO: What is the purpose of your visit?
Me: To attend Training

VO: What training?
Me: Explained that it is related to YYYY XX

VO:Which Company?
Me: Said company name

VO: How long you are working
Me: 7 years

VO: How long is the training?
Me : 2 weeks

VO: Cant hear you
Me : (went near mic and spoke)

VO: Speak loud
Me : Is it audible now

VO: You need to speak loud,Why training is happening in US?
Me: Pardon me

VO: Why is it in US?
Me: Told the reason ( I got nervous becuase 2 times he said he cant hear me)

VO: Why did you visit "Country"?
Me: Project Transition

VO: Your Visa is approved
Me: Thank You

I carried bunch of documents but he didn't ask for any. As per me DS160 plays major role in VISA approval. The purpose of your travel should match with your profile and your experience with company also matters.