You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Amy Moore here, I want to change my existing reservation due to my sudden promotion. Hoping that your helping me out.

ASSISTANT: Please provide your name to check whether your reservation is existed or not.

USER: I have given already.

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

USER: It's ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for checking.