You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Myself Emily Young. I want to change my existing reservation.Could you please help me out?

ASSISTANT: Please wait a moment to check your previous reservation status.

USER: Ok.

ASSISTANT: Sorry Emily, there is no reservation found under your name in our database.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.