Hi Jatinder,
Thanks for reaching out!
There is not a way to do this out-of-the-box, but you could do it with a customization. This post has some example code that you could use as a starting point on limiting the number of tickets (note that this will be per transaction, not per user). Once you set the default, you could then hide the input with CSS to help prevent users from being able to change it. This article also has some good info and examples on setting quantity limits. To prevent the same user form coming back and registering again, you would need to do some additional customizing.
We are limited in the amount of support that we can provide for customizations, but if you get stuck or have any questions, please let me know – I’ll be happy to point you in the right direction!
Thanks,
Jennifer