public void Accept()
 {
     //check rule
     PassengerBookingProposalDecision = PassengerBookingProposalDecision.AcceptDecision(DateTime.UtcNow);
 }
 public void Rejected(string rejectedReason)
 {
     //check rule
     PassengerBookingProposalDecision = PassengerBookingProposalDecision.RejectDecision(rejectedReason, DateTime.UtcNow);
 }
 public void Verify()
 {
     PassengerBookingProposalDecision = PassengerBookingProposalDecision.CreateToVerification(DateTime.UtcNow);
 }