You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: I am Ashley Taylor. I would like to change my existing reservation, due to postpone of my training class. Can you please help me?

ASSISTANT: Sure, I will help you with that. Please wait for a moment, while I search for the reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for reaching us, we hope see you again.