You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am James Moore. I want to change an reservation, due to exams. Can you please change my reservation?

ASSISTANT: I can help you with that.

USER: Thank you.

ASSISTANT: Sorry Moore, there is no reservation found on your name.

USER: That's really sad to hear. Thank you for your help.

ASSISTANT: You are welcome.