Visitor Visa - B2

Hi everyone

I am 31 year old I have applied b1/b2 visa with my wife..My interview was on 18 September at 09.00 AM. I got refusal…see below the interview

VO: Good Morning. How are you
WE: Good Morning sir Fine. And how r u

Vo: I am good
Vo: are you husband wife?
me: yes

Vo: How long you have been married
me: 8 year

VO: how many children you have
me: two

VO: why are they not going with you
me: because of their studies

Vo: why you are going to US
me: for tourism

VO: where are you going?
me: New york, Washington DC. Los Angles..las Vegas..san Francisco (Because I have booked a tour package)

VO: What Job you doing
me: Banquet Manager

VO; In which hotel??? Asks me again
me: Hotel ……………

To My wife
Vo: what do you do
wife: House maker

Vo: have you traveled before?
me: I did not a get the time because I was busy in my job to settle my carier.

VO; Sorry I can’t give you visa today
Me: Thank you Sir (with smile)

I don’ t understand what is the exact reason for refusal..Pls frnd suggest me what should I do for next re-apply.

Please give me suggestion

thnx