Dreams about travel and social interactions often reflect your feelings about exploration, connection, and sometimes, disconnection. In your dream, being on holiday in a hostel suggests a desire for adventure and new experiences. The presence of the girls from Switzerland may symbolize camaraderie or the desire for social bonds, possibly indicating you are seeking new friendships or connections in your waking life.

The tour bus represents a shared journey, suggesting that you may be in a phase of life where you are navigating through experiences with others. However, the abrupt ending of the tour and the issue with the bus driver highlights feelings of frustration or betrayal. This could symbolize a fear of being taken advantage of or feeling unsupported when you need help. The secretive nature of the bus driver and being overcharged may reflect anxieties about finances or feeling like you're not being treated fairly in some aspect of your life.

The fact that you couldn’t remember the names of the girls and their friend might suggest feelings of uncertainty or insecurity about your current relationships or social standing. You may feel that you are losing touch with people who are important to you or that you are not making lasting connections.

Overall, this dream may be prompting you to reflect on your social interactions and any feelings of being overwhelmed or unsupported. It could encourage you to communicate more openly with those around you and ensure that you are feeling valued and heard in your relationships. Consider if there are areas in your life where you feel taken advantage of or overlooked, and think about how you might address those feelings.