Hello.
user
Hello, how may I help you?
assistant
I would like to change my existing reservation, please help me out.
user
Sure, I will help you with the change of flight reservation. May I know your name please?
assistant
Sure, my name is Samantha Davis.
user
Thanks for waiting patiently. But I regret to inform you that that there is no flight reservation on your name to change it.
assistant
Ok, no problem. Thank you for your information.
user
Thank you.
assistant