You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: Would you please help me with changing my reservation to new travel dates?

ASSISTANT: May I know your name please?

USER: Ok, my name is Catherine Johnson.

ASSISTANT: Please wait for a while.

USER: Sure, take your own time.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: It's ok, thanks for checking.

ASSISTANT: Most welcome.