You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Amy Collins. My family tour trip got postponed, so I want to change an existing reservation.

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to inform you that there was no reservation found on your name.

USER: Not an issue. Thank you.

ASSISTANT: Ok, Thank you for choosing us.