You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Lisa Gonzalez.

ASSISTANT: How may I aid you?

USER: I want to change my existing reservation as my tour got cancelled.

ASSISTANT: Sure, I am here to help you out.

USER: Thank you.

ASSISTANT: Lisa Gonzalez, we regret to inform you that there is no reservation found on your name in our records.

USER: No issues, thank you.

ASSISTANT: Thank you for approaching us.