Serve is not the same as service, though they are both regular verbs (serve/served/served, service/serviced/serviced).

Serve is the verb of waiters, clerks, and attendants, and it means “to help a customer.”

• The attendant served his customers quickly and efficiently.

Service is the verb of technicians, and it means “to repair or maintain a machine.”

• The mechanic serviced the car before the trip.

If you use the verb “service” in place of “serve,” it is incorrect.

• The waiter serviced his guests <- never, unless the guests are robots.

Service is a noun relating to the ability of waiters, clerks, and attendants to do their jobs.

• The service is great here. I never have to ask them to pour more coffee!