HI,GOOD MORNING
Good morning! You've reached Flamingo customer services. How may I help you today?
I ALREADY BOOK A TICKET BUT I CHANGE MY SEAT
Definitely!  I'd be glad to help you with that. Could you please help me with your last name and your booking confirmation number?
Gustavo AND GD54N7
Awesome! May I also know your seat number?
N7
Alright! Could you please help me with your preferred seat? (aisle/middle/window)
WINDOW
Thank you for that! Could you please allow me a moment, while I check for the availability?
Ok, I wait for your information.
I've gone ahead with your request and here is your new seat  number i.e B32 which is a window seat, hope that will be comfortable.
OK
Great! Is there anything else that I may help you with?
NOTHING ELSE
Lovely! Thank you for visiting us, wish to serve you again. Have a safe flight!