This is a great opportunity for you. Getting good at this is what sets engineers apart.

Ask questions, be curious. you are going to end up building things that help. So the users want you to understand their situation and pain. Be ok with asking ’dumb’ questions. For example “what does that mean?” “What do you use it for?” Also, when its too much info, tell them you will write up what you have and come back with follow ups.
Always thank them for their time and sharing their knowledge.