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Tourists need a rocket in range in order to leave, when a rocket lands nearby to their dome, they will depart. Its possible your overstaying tourist moved to another dome further away from the rocket that dropped them off so now they cannot walk back.

You can solve it by landing a rocket closer to them, or moving them back to a dome nearby to a rocket. Using the hotel to control where they live can help with these issues, aswell as using dome filters to stop them going to domes you don't want them to.
 
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