Preparing for my first conversation with a native speaker—how do I avoid 'scripted' responses?

I've been learning Mandarin for three months but I feel like I only know how to answer questions from my textbook. I have a coffee chat with a native speaker coming up and I'm terrified they'll speak too fast and I'll just panic. Does anyone use Chickytutor.com to simulate unscripted, natural dialogue to bridge the gap between textbook Mandarin and real-world chatting?