She is, at least, enough of herself that she doesn't say that it's a pleasure to meet him in return. They've only just met; who's she to say? Besides, all the HappiTime pills in the world won't make her better at socializing. Most likely nothing will. But she is trying a little more than Katniss normally would. So Katniss nods in response. It's better than nothing.

"Are you the only one singing tonight?"