Things I use as backups for when the conversation dies is play games like the word association game, ask rapport questions. One question I like to ask to build comfort/rapport in a big way is ''tell me a secret. It can be any secret, big or small, but it has to be something that no one else knows - just me and you.''
Also I love to use the cube, thats a great one, you can make it last as long as you want and go into as much detail as you like. I don't think ive ever cubed a girl and not had them as putty in my hand afterwards. Its dynamite if you can do it well.
Just dont let the conversation die, and be prepared to hang up if things start dying down
