You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Nicole Harris. I am trying to change my existing reservation but I couldn't change it. Can you please help me with this?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please hold on a moment.

USER: OK.

ASSISTANT: Sorry, there is no reservation found on given name.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for reaching us.