Hi, It's understood that you need to develop a booking website, where users will be able to book flights, trains, hotels. We had developed similar websites previously, kindly have a look: www.tripmegamart.com.
Kindly let me know a few things, so I can reach your end needs and submit our final offer to you.
1. Did you finalized any flight booking API?
2. Did you finalized the train booking API?
3. Do you want to use any API for hotel bookings or hotel owners will register in the website and list their hotels to populate your hotel database?
Kindly initiate a message, so we can have a discussion to finalize your end needs and submit our final offer to you.
Thanks
Netdevbiz-team