By mistake if you have created two or more guest profiles for same contact, so here you can merge profile and make it one. Guest history also merged with this action.

Location:
 eZee Frontdesk >>   Front Office >> Guest Database >> Options >> Merge Profile 

How to Access:
Please follow below steps to merge profiles

Screenshot 1:
Screenshot 2:
Make master profile to keep contact.
Note: This process is not reversible. You can confirm and click on Yes/No.