You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I want to change my reservation, can you help me?

ASSISTANT: Sure, I will help you out with that. May I know your name to check your previous reservation status?

USER: I am Michael Evans.

ASSISTANT: Ok, please give me a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name in our records.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us.