Women hate to be put on the spot or to feel that they can’t get away. You want to leave her with a short powerful impression so that she is left intrigued. You also want to let her know that you fancy her, so you say “anyway I have to dash, great meeting you, I had to say hi because you look “insert appropriate adjective” hot, beautiful, gorgeous, lovely smile etc… NOT ‘great tits, nice ass etc… lol. ‘Here’s my number if you fancy having a coffee some time. I’d love to hear from you. Have a great day/evening.’
If you don’t have the balls to carry on the conversation after your initial opener you politely walk away saying it was great to meet you, ‘insert name’ you look amazing and I had to come and say hi. next time you see her, you already know her name and can start the hello ‘insert name’ how are you? You have made that initial contact.
NB: If you want to get good at waffling, find a bunch of women and listen to what we talk about. We could talk for an hour about the prices of peas! Learn from the masters of small talk!