Final answer:
If someone has lost or does not have their identification at check-in, the appropriate action would be to ask them to provide alternative identification.
Step-by-step explanation:
If someone has lost or does not have their identification at check-in, the appropriate action would be to ask them to provide alternative identification. It is important to verify the identity of individuals for security purposes. Allowing someone to proceed without identification or refusing them entry without trying to find an alternative solution would not be ideal. Calling the police would only be necessary if there is suspicion of illegal activity.