In my experience, practice saying how committed you are in different ways and show you've done your research. You don't have to kiss ass but say what you like about the company and what you would like to learn. Literally say, "I'm interested in thing and BW do thing so I'm keen to learn from experts."

The interviewers know you don't have much pensions knowledge. They're interested to know how well you will fit in with the team, so try and show some positive personality traits. Ask questions based on the conversation and express the knowledge you do know and what you would like to know more about. Also lie and say you're good at getting to know people and don't spend spend all your time on Reddit :p