Can I modify my air ticket? Giamso Tours does not handle ticket modifications. Please cancel and rebook (The ticket will have to be cancelled and a new ticket will have to be purchased) or contact the carrier directly. Was this article helpful? Can't find what you're looking for? Inquiry Form Related articles Can I change the dates of my flight? Can I change the dates of my flight? Can I add on baggage afterwards? How do I cancel my flight reservation? I have made a mistake in my passport information.