I'm not who you want me to be

You just wanted to do some shopping, as a stranger comes running up to you and hugs you. The stranger calls you the name of his/her previous partner who passed away during a car crash. But he/she doesn't seem to accept his/her partners passing and since you have the same hair, eye and skin colour. He/she mistakes you for his/her previous partner. Now what will you do now? Try and explain? Or play along and let him/her down gently? Or maybe something different? The choice is yours. But if he/she accepts the truth... that is still unknown.