This happens at nightclubs a lot. It’s hard to hear, the guy is usually taller than the girl, so he leans in to hear what she’s saying. Don’t do this. It looks awkward and will make her feel awkward if you stay in that position for a while. If you don’t hear something she says in the first couple minutes, just carry on talking. It kills the momentum to ask her to repeat herself. If it’s after the first few minutes, then not being able to hear is a great opportunity to move her somewhere quieter.