Planning a trip, be it for a critical business conference or simply a momentary escape from the savage rat race, requires no doubt considering how you are going to get anywhere—obvious enough. Making a spontaneous decision to head to the other side of the world on the same day, getting all packed up, going to the airport only to find that there are no more flights available is not appealing even to the severely impulsive traveler. Effectively planning a trip includes making sure that you have all the bases covered, including transportation.
Ticket booking ensures that the traveler has a comfortable seat on the plane, and can be done from a long time before the date of departure, and ultimately resulting in you having a more convenient trip, avoiding the irritation of long last-minute ticketing lines. The ticket booking process itself is not difficult; one simply need to get either on the phone or online to find available flights and make the necessary arrangements with ticketing agencies or the airlines themselves.
There simply is no reason to take the rough chance of not being able to get a flight; booking your ticket in advance is the responsible and most assuring way to travel.