My Deluge experience is minimal and rusty

Form A has the following Fields:

"Account_Number"

"Account_Name"

"Account_URL"

Form B has the following Fields and contains all the data

"Account"

"Name"

"URL"

I'm trying to get this to work using Deluge:

Users enter a 10-digit numerical string in "Account_Number" in Form A. 

"Account_Number" is matched against Form B to populate "Account_Name" & "Account_URL" Fields

Assuming that "Account_Number" matches with the User's "Account_Name", the User submits, sending an email containing all 3 values to a group email 

If "Account_Number" (Form A) has no match with "Account"(Form B) they get an Error message "Account does not exist"

I don't want to use a LOOKUP Field for Account_Number because if they don't know their Account Number they don't need to use the Form (In fact, the Account_URL Field remains hidden)

Is this even possible? Does anyone know how to achieve this?