Dawn

Dawn is a woman at a bar who flirted with Sheldon.

History
Sheldon found Dawn attractive, so he hit on her. However, he was interrupted by Pete, who then sabotaged the interaction.

Dawn later found Pete, but he redirected her back to Sheldon and they left together to share a meal.

Romantic
She flirted with Sheldon and Pete at a bar, but left with Sheldon.