If we have tickets, should we show it during interview?

[poojac]

I have got my tickets issued already and have my Visa appointment on 16th Dec.

Should I show /mention about my tickets during interview.

Or will they take it in negative way, that you have not got the Visa and you have
already got your tickets !!

I was getting the tickets on low-fares, so got them issued.

What is the general opinion about the same.

As I have already got the tickets issued, the dates of departure and arrival are confirmed.
I have mentioned the same dates in DS-156.

Will mentioning about the tickets, have positive or negative impact?