You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I help you out?

USER: I want to change my existing reservation as my destination of travel has been changed.

ASSISTANT: Ok.

USER: Will you help me in changing my reservation?

ASSISTANT: Sure, May I have your name, please?

USER: I am Donna Perez.

ASSISTANT: Ok, Donna Perez, your name is not in the list to change.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for availing us.