Hi.
user
Hello, how may I aid you?
assistant
I am Melissa Nelson. I want to change my reservation, can you help me?
user
Sure, I will help you with the change of flight reservation.
assistant
Thank you.
user
Thanks for waiting. But I am sorry to say that there is no reservation on your name to change it.
assistant
No problem, thanks for checking.
user
Thank you.
assistant