Hi Chintan,
The order confirmation email is actually contained in WooCommerce. Here is the documentation for how to customize WooCommerce templates:
Template structure & Overriding templates via a theme
The ticket email can be modified by:
- Make a copy of the template. It is located in wp-content/plugins/event-tickets/src/views/tickets/email.php
- Make a new folder in your theme called tribe-events
- Make a new folder in that one called tickets
- Add the copied email.php file to that last folder
Now that the template is in your theme, you can modify it to suit your needs and the changes will be reflected.
Cheers!
Geoff