is there any Gold Entity which holds Alphanumeric string in sap CAI

Hi,
I have a scenario where the input is Alphanumeric eg: BOFCUS33POR, BKTRUS33050
is there any Gold entity which will take the Alphanumeric strings as input from the chat,
i have tried using Organisation, Person, Phone as well but they are not working,
Is there any other way to solve this with out creating custom entity?

can you help me here
Thanks

Kishore