I think about my mother and I getting really sad. She has been dead for 15 years now.
I really do miss my mother. She has been dead for about 15 years now.
user
I'm very sorry for your loss. Thinking about and remember all of your good memories with her may help.
assistant
It is a blessing and curse. When I am having problems I think about what she would say to me.
user
That's a good way to remember her and keep her close to your heart.
assistant
Yes, it is. I know that time heals.
user
Yes, it does. 
assistant