You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Nicole Lopez. I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Nicole Lopez, no reservation found on your name to change.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you.