Austrian financial services provider seeks software for booking themed trips

I am a self-employed financial services provider and am planning to establish a new business area. Therefore, I am seeking software for booking themed trips without arrival and departure (e.g., flights). This means I am seeking software for booking packages (hotels, local services, events, tours, seminars, etc.) and arranging travel events.

The software should meet the following requirements:

• Direct booking through me (except for arrival and departure)
• Online booking of themed trips (similar to hotel booking) with multiple overnight stays
• Possible booking of individual modules
• Ideally with connection to systems that update room availability in real time
• Travel agency software is probably too much - hotel reservation software is probably not enough
• German language is sufficient
• Web- or browser-based
• Responsive design is not so important

One software workstation is planned.