person A: I was pretty nervous starting my new job. I was not sure what to expect
person B: Wow_comma_ congratulations on getting a new job!  I think butterflies are good to have to make us do our best and it shows your job is important to you and you want to do a good job.  What do you do?
person A: Its in production
person B: That sounds fun. Have you done something like it before or is the whole kind of job new to you?  Good luck and I know you'll do great!  Act confident even if you don't feel like it. Sometimes that can help.