Amazon lex Slots break

hi i have 2 slots type in lex one is Membership Number and 2nd is Pin. i wanted to know, in contact flow can we check Membership number from database before moving to second slot which is pin. mean if we enter wrong membership number it check first if it is wrong then ask me again to say membership number (means check each slots 1 by 1 from db). hope so you understand my question. Thanks