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

ASSISTANT: Hello, how can I help you?

USER: I want to change an existing reservation due to my seminar got postponed.

ASSISTANT: Sure. Can you please wait for a moment?

USER: Sure.

ASSISTANT: Unfortunately, we did not found any reservation on your name.

USER: Thanks for your information.

ASSISTANT: Thanks for contacting us.