Hello @mandeepdebnath,
First of all thank you very much for using the plugin.
The email from the booking/enquiry is sent to the admin or to be more clear the email that is entered in Admin Panel > Settings > General > Email Address.
So whatever email you place here will get the email of booking and enquiry.
Hope this clears the confusion.
Also, for your request for customizing the booking form, we would like to suggest you to hire a professional developer for this.
To hire a developer please refer to below given link:
http://wensolutions.com/hire-wordpress-customizer/
Hope this helps.
@shuttletransfer,
As mention above the email is sent to the admin. If you have any query further then please post them.
Thank you.
Best Regards!!