i have tested the code from the pull request https://github.com/webkul/hotelcommerce/pull/170
and it's working as expected.

but today i notice that the pull request was closed and the code was never committed.

i think the solution chosen by the webkul team was
"added hotel column in invouce and mail "
https://github.com/webkul/hotelcommerce/commit/14e594a73352d8ca7712fbbfad74ba683d39bcf8

are you sure this is the right approach?, because the last time i check in qloapps when making one booking for 2 different rooms in 2 different hotels you will generate 2 orders, and each order has its own invoice... which make hotel column in invoice is really not necessary...
in my opinion making the footer hotel details (hotelname, address, contacts, etc) for the current booked room is already a good solution.

but of course the final desicion is up to the webkul team

how can we show the hotel name in invoice instead of store name,
because i understand qloapps support managing multiple hotels but why in invoice show store name instead of hotel name, which file do i need to modify to implement this?

it should shows hotel name from
Hotel Reservation System > Manage Hotel > Hotel Name
instead it shows
Preferences > Store Contacs > Shop name