Hello.
Hello,. How can I oblige you today?
I would like to change my reservation due to heavy floods at my destination place, so aid me in changing.
Sure, we are here to aid you. Let me know the your name to check with the reservation.
Sure, my name is Alexander Nelson.
Please, stay online.
Sure.
Thanks for your time, there is no reservation found with your name  Alexander Nelson.
No problem, thanks for your quick response.
Thank you for availing us.