Which company invented the first portable CD player?
user
I’m not sure. Maybe Sony?
assistant
Do you know Sony'
user
No.  Sorry, I don’t know that.
assistant
Do you know Sony's first portable CD player model number?
user
No.
assistant
Which company invented the first portable CD player?
user
I’m not sure. Maybe Sony?
assistant
Do you know Sony'
user
No.  Sorry, I don’t know that.
assistant
Do you know Sony's first portable CD player model number?
user
I'm sorry, I don't.
assistant
Which company invented the first portable CD player?