What's the step type and how?

Hi experts,

I have a userdecision as soon as the workflow starts.If the user selects NO the next task must be the same userdecision unless he selects YES.There must be a deadline remainder,if the user doesnot choose the YES option after a specific time period(say for 5min).

How to set up this activity?

Any inputs will be appreciated.

Thanks in advance.