You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I serve you?

USER: Due to an emergency, I want to change my existing reservation. Can you help me?

ASSISTANT: To change your reservation, may I have your name please?

USER: Edward Young.

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

USER: No problem, Thanks for the confirmation.

ASSISTANT: Thank you.