You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Emma Taylor. I want change my reservation, can you please help me?

ASSISTANT: Ok, please wait a moment I will check your reservation status.

USER: Sure.

ASSISTANT: Sorry to say, there is no reservation found on your name to change it.

USER: Ok, thank you for informing me.

ASSISTANT: Thanks for contacting us.