You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I support you today?

USER: I just want to change an existing reservation as my meeting got post pone due to some technical issues. Can you please help me with this?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Can I have your name please?

USER: Sure, I am Nicholas Moore.

ASSISTANT: Ok, wait for sometime.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found on your name to change.

USER: That's ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.