The error message displayed when the user enters an invalid insurance id for the addInsurance command is:
This Insurance Plan ID is invalid!
This message does not provide the user with knowledge about "what is a valid Insurance Plan ID?" It is recommended to include the valid Insurance Plan IDs within the error message, so users do not have to look up the user guide every time.
E.g. Please enter a valid Insurance Plan ID! (0 - Basic Insurance Plan, 1 - Travel Insurance Plan)
