Dad (Something you don't have) - A Dad (Something you don't have) is the thing you need most

A Dad (Something you don't have) is the thing you need most but won't ever get.

'If I had a Dad (Something you don't have), I'd be cool.'

'I want a Dad (Something you don't have). I'll settle for a dad.'

'A Dad (Something you don't have) is the only thing I want.'