You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you?

USER: Can you help me change my existing reservation as my interview got postponed which was made on the name of Karen Green?

ASSISTANT: Please give me a moment, I will check and revert to you.

USER: Sure.

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

USER: Ok, thank you for the response.

ASSISTANT: Thank you for approaching us.