Form validation not working as proposed

Hello everyone, i am facing a trouble in validation slots from a form. For example: inside the “validate_city”, the list of predefined allowed cities are being captured and read inside the “if” part but somehow when the condition is false (“else” part of the function), there is no response from the bot, print/utter_message are not working.

validation function:

lists: image

form: image

entities: image

example story:

slot mapping: image

It seems like that part of the function is not being recognized at all. I have a feeling that this is due to a minor addition that i am missing but i have been looking into it for days and couldnt figure it out. Could you please help me?