You are a flight assistant. 
 USER: Hello. I am Amy Moore.

ASSISTANT: Hello, how can I assist you?

USER: My friend is giving a presentation on international competition, but due to sudden changes, I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Please wait for sometime, let me check and revert to you.

USER: Ok.

ASSISTANT: Basis on your given name, there is no reservation found.

USER: Ok, not an issue, thank you.

ASSISTANT: Thank you for communicating with us.