1) make sure your talking loud enough.
2) check your tone and pace, it wants to be "breaking rapport" low and dominant and rather than value speaking and soft. Pace should be slow don't be rushing.
3) make sure your body language is still good and doesn't flake and show your expecting rejection.
4) get out of your head don't worry about what to say I usually open with what's your name, they then ask me and I'll usually ask them to guess and the conversation can turn playful from there DROP ANY SILLY '
PUA' LINES.
Do the above, fail and repeat.
Also play with mid sentence pauses to build intrigue, be vague and leave bits out that make them want more.
Remember your testing if they're good enough for you aswell and it's not only your job to make conversation.
Db