You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be your helping hand today?

USER: I am Anthony Smith. I need to change my existing reservation. Can you please help me out?

ASSISTANT: Sure, we will help you for changing your reservation. Please hold on.

USER: OK.

ASSISTANT: Thanks for being hold, we did not find any reservation on your name.

USER: OK. No issue. Thank you for the information.

ASSISTANT: Thank you for opting us, have a nice day.