I want the user to not be asked again about their contact information every time they use the bot, I want the bot to learn users so that when they return they have a more personalised conversation. I tried user variables but didn't know how to keep the user's information saved in them. In the contact info capture cards, I turned on the option which says skip if variable is filled but didn't work. I did a quick check before asking them for their information if the user variables are already entered in the table (I created a table to store the user's info in it) but still didn't work.

You can do it using KB tables, and here is another idea from two days ago without storing the data in KB tables. Note that user variables work after you publish the bot, not in the Emulator (which always starts as a new user) https://discord.com/channels/1108396290624213082/1220364417238040697