You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

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

ASSISTANT: Sure, I am happy to help you with that. Can I have your good name please to check your reservation status?

USER: Gregory Brown here.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry Gregory Brown, no reservation has found under your name to change.

USER: That's not an issue. Anyway thank you for checking.

ASSISTANT: Thank you for choosing us, have a good day.