Social Recovery( Complete Scoundrel, p. 89)
[Interaction, Skill Trick]
You can talk your way out of a problem you talked yourself into.
If your Diplomacy check to influence an NPC's attitude fails, you can spend another full round talking to the NPC, then make a Bluff check with a —10 penalty. Use the result of this check in place of the Diplomacy check result, except that it can't improve the NPC's attitude by more than one step.
Once you use this skill trick (successfully or not), you cannot use it against the same target again for 24 hours.