this. be nice, mirror their energy. If they're excited, share the excitement. pick up some of their lingo, what shows they watch, etc (in a subtle way- ask for recommendations). Make eye contact, smile, laugh at their jokes, say their name when you speak to them.
See what you have in common and indulge in it (you both like coffee? bring her a cup one morning. You both watch some anime? get matching keychains with her for her birthday or something).
But ultimately, being nice is the best thing to do. Also don't say anything weird kek. How are you doing?