gistfile1.cs

    public class Guest : ReceiveActor
    {
        public Guest()
        {
            Receive<Badge>(badge =>
            {
                // ... do something with received badge
            });

            // it would be better to expose some kind of "address book" actor,
            // that returns actor refs for keys on demand
            Context.ActorSelection("/user/Klara").Tell(new BadgeRequest { Name = Self.Path.Name, LicensePlate = "AAA111" });
        }
    }

    public class Receptionist : ReceiveActor
    {
        public Receptionist()
        {
            Receive<BadgeRequest>(badgeRequest =>
            {
                var badge = new Badge
                {
                    Id = Guid.NewGuid(),
                    Name = badgeRequest.Name,
                    ValableOn = DateTime.Now,
                    DeliveredBy = Self.Path.Name
                };
                Sender.Tell(badge);
            });
        }
    }