You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you now?

USER: Due to some work, I want to change my previous reservation. Can you please help me for that?

ASSISTANT: Ok, may I know your name for checking your booking status?

USER: My name is Dorothy Hall.

ASSISTANT: Please be on hold for a moment till I check with your status.

USER: Ok, I will wait.

ASSISTANT: Dorothy Hall, there is no flight reservation found by your name.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing our services.