I've never posted here in this forum before, but thought what the **** - may as well jump in!
Why are you going to see the dietitian? You've made the appointment for a reason - what are you expecting he/she can do for you?
If it were me, I'd sit down and figure out exactly what I wanted to get out of my visit, write a list and take it along with me. Then check and make sure I've covered everything I wanted before I left. Are you after a meal plan, an understanding of how foods effect health, do you have a health condition (other than being overweight

) that a change of diet may help improve?
Not that I've ever been to a dietitian

, but I wish you the best of luck with it all ....