Booking Holdings Exec Says AI Driven Referrals Remains A Relatively Small Contributor To Our Overall Business Today; We're Embedding AI Across Our Own Platforms To Make Every Stage Of The Travel Journey More Personalized, Seamless, And Intuitive; During The Quarter Continued Advancing AI Capabilities Across Our Portfolio; Revenue Growth Was Lower Than Gross Bookings Growth, Primarily Due To Elevated Cancellations In March That Affected Q2 Revenue