You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best assist you?

USER: I am Emily Lewis. My family tour trip got postponed, so I want to change my existing reservation.

ASSISTANT: Sure, I can change your reservation right now. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that there is no reservation found on your name.

USER: Not an issue. Thank you.

ASSISTANT: Thanks for approaching us, have a nice day.