You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: Can you aid me to change my reservation due to an emergency?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Robert Robinson here.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: No issue. Thank you.

ASSISTANT: Thanks for contacting us.