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

ASSISTANT: Hello Ronald, how can I assist you?

USER: I want to some modifications in my existing reservation. Can you help me?

ASSISTANT: Sure, I am here to aid you. Let me first check your reservation status.

USER: Sure, take your time.

ASSISTANT: Sorry Ronald, I did not find any reservation under your name in our database.

USER: No issues. Thank you for checking.

ASSISTANT: You are most welcome and have a nice day.

USER: You are welcome.