Virtual service for ingress gateway

Hi All,
we are using istio in AWS EKS.
I could see the istio virtual service can be created using variety of steps in the below link

But if we want to access a service using ingress gateway load balancer, we normally create virtual service and mention the uri which we can use with load balancer like path based routing, but if we create virtual service like below, how do we reach the service through ingress gateway where we didnt mentioned any path.

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: ratings
spec:
hosts:

  • ratings
    http:
  • match:
    sourceLabels:
    app: reviews
    route: