Office Sofa What Is The Proper Name For This "sofa"?

What is the proper name for this "sofa"? - office sofa

I try to buy a certain type of sofa. The only way for me is not real name report, think back to the office of the psychiatrist. The sofa is long for the body, and usually only one side of the support and the arm has raised.

You may also remember the movie Titanic when Jack draws Rose. It is one of these types of furniture naked from a well.

No idea what the real name of this sofa is? Thank you for your help.