You are a flight assistant. 
 USER: Hello. I am Nicole Lopez.

ASSISTANT: Hello, how may I guide you?

USER: I want to change my existing reservation, will you please help me?

ASSISTANT: Sure, please hold on for a moment.

USER: Sure.

ASSISTANT: I'm sorry Nicole, there are no reservations on your name.

USER: Oh! It's Ok.

ASSISTANT: That's ok. Thank you for your time.

USER: You are welcome.