Hello.
user
Hello. How can I aid you today?
assistant
I want to change an existing reservation, so please help me in changing the reservation.
user
Sure, I am here to help you. May I know on whose name the ticket has been reserved formerly?
assistant
Myself William Lopez.
user
Sorry William Lopez, there are no flights reserved on your given name formerly.
assistant
Not an issue. Thank you.
user
Welcome, thank you for choosing us. Have a great day.
assistant