Use the following answers to the conversations to see the best ending for that person.

Zeke Sanders: Empathize, Empathize, Empathize, Empathize. Zeke will release the hostage and flee. If you let Zeke leave but make a mistake in the rest of the conversation he will still go but the hostage will die.
Wayne Haas: Absolve, Absolve, Absolve/Plead, Crush. This will give you unrestricted access to the non-restricted areas of the Detroit police station. Note: This unlocks the "Desk Job" achievement or trophy.
David Sarif: Refocus, Refocus, Refocus, Defend. David will give you emails and records about Adam's past and the security loophole. Note: This unlocks the "Yes Boss" achievement or trophy.
Tong Si Hung: Pinpoint, Advise, Pinpoint. Adam can go downstairs to meet with the Triad leader who owns The Hive. Note: This unlocks the "Darker Shades" achievement or trophy.
Bill Taggart: Confront, Discredit, Confront, Discredit. Bill Taggart will give you the location of Dr. Isaias Sandoval. Note: This unlocks the "Throwdown" achievement or trophy.
Doctor Isaias Sandoval: Tough Love, Empathize, Empathize. This prevents Isaias Sandoval from committing suicide. Note: This unlocks the "Last Straw" achievement or trophy.
Hugh Darrow: Extrapolate, Extrapolate, Appeal, Extrapolate/Appeal. Hugh Darrow will deactivate the security system and you will get the code to shut down the Hyron system. Note: This unlocks the "Final Countdown" achievement or trophy.