Lock anything you mentioned and warn your bank
There's a clear pattern: identify which account was exposed by the conversation, then act on that account first. Don't rely on 'they didn't sound that smart' — assume professional fraud.
If they asked you to install something
Apps installed via SMS links almost always include remote-access or banking-trojan capability. Don't open the banking app on that device until it's been wiped or scanned by a trusted security tool.