You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to modify my reservation which I have done last week under my name James Martin. Can you please help me about that?

ASSISTANT: Sure, I am glad to help you with that.

USER: Thank you.

ASSISTANT: Can I know your name to check your previous reservation?

USER: My name is James Martin.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that, there is no reservation with your name in our records.

USER: It's ok, anyway thank you for the information.

ASSISTANT: Thank you for approaching us, have a great day.