You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Nicole Roberts. Could you please help me to change my existing reservation?

ASSISTANT: Sure Roberts, please wait for a moment.

USER: Sure.

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

USER: That's ok. Thank you for the information.

ASSISTANT: Thank you, for consulting us.