You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Can I know your name?

USER: Raymond Allen here.

ASSISTANT: Let me check details with your recent reservation.

USER: Ok.

ASSISTANT: Sorry, there is no reservation by name Raymond Allen.

USER: Thank you.

ASSISTANT: Thanks.