You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: flight.go
    path of file: ./repos/scan4all/vendor/github.com/pion/dtls/v2
    
    the code of the file until where you have to start completion: // SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
// SPDX-License-Identifier: MIT

package dtls

/*
  DTLS messages are grouped into a series of message flights, according
  to the diagrams below.  Although each flight of messages may consist
  of a number of messages, they should be viewed as monolithic for the
  purpose of ti
    
func (f flightVal) String() string {
	switch f {
	case flight0:
		return "Flight 0"
	case flight1:
		return "Flight 1"
	case flight2:
		return "Flight 2"
	case flight3:
		return "Flight 3"
	case flight4:
		return "Flight 4"
	case flight4b:
		return "Flight 4b"
	case flight5:
		return "Flight 5"
	case flight5b:
		return "Flight 5b"
	case flight6:
		return "Flight 6"
	default:
		return "Invalid Flight"
	}
}