Visitor Visa - B2

Hi,

Toay on 3/28/2016, 8:00 am was our visa interview

I applied for a visitor visa along with mu husband for US. My sister, brother and brother in law stays in US.
We had a plan to visit US on occasion of my niece 2nd bday in May this year, and also had plan to visit number of other places. My sister had send an invite letter to me and we were suppose to sponor ourselves. along with us my parents were also suppose to join us (they already have a visitor visa and been to US before).
My husband works in a Govt firm and I'm in an IT company, we both earn good based on the experience level.

The interview started as
Q1. Why you want to go to US?
A1. To meet my sister and celebrate my niece second bday together we also have a plan to visit a number of tourist places in US.

Q2. Whn did your sister go there?
A2. after her marriage in 2010.

Q3. when did you last meet your sister?
A3. Jan 2012

Q4. Where do you work ?
A4. replied company ZZZ

Q5. (To my husband) where do you work ?
A5. replied govt company ZZZ

Q6. Duration of work (to me)
A6. Replied

Q7. Asked about my previous company
A7. replied

Q8. (To my husband) duration of work and designation
A8. my husband replied that he will complete 7 yrs and shared his designation as well.

Q how long have you been married.
A. we both replied together 3 years

Q how long you want to stay in US?
A we both replied together 3 weeks.

Q9. Do you have any US visa.
A9 . No
(this is did not speak but was mentioned in my DS-160, my company had applied for my L1 which was not approved and i had stated the truth in DS-160), but in interview he asked if i hold any US visa for which is simply said no and avoided to bring this thing up.

Q10. DID to travel abroad before this.
A10. Replied no we haven't, but we have traveled and number of places in india, named a few which the interviewer did not even bother to listen

After this he said i m sorry you can not get the visa as i feel you do not have strong ties in your country and handed over our passports.
He did not ask us any question regarding our ties nor asked for any documents, my husband is the only son, we have a home loan ongoing, and we both have good jobs and had all reasons to come back.

Can anyone help us understand the exact reason for this rejection? Also when can we plan to apply again as i wanted to go to US to meet my sister.
how do i prepare better next time, i had rehearsed all questions well from the forums available and did not lie any where in my DS -160 or interview.

Please help!!!
Thanks.