Core Conflict:
- Frank wants to go to Prague, seemingly as a requirement or demand.
- Katrin feels hurt and confused by Frank's behavior, especially since she considers them friends.
- Katrin's mother suspects Frank's intentions are selfish, suggesting he wants Katrin's undivided attention and might be jealous or possessive.
- The underlying tension is whether their friendship is strong enough to withstand Frank's demands and Katrin's potential desire to go to Prague.
Summary: The central conflict revolves around Frank's strong desire to go to Prague, which he presents as a demand rather than a request, leading to Katrin's feelings of hurt and her mother's suspicion of Frank's possessive intentions towards their friendship.