You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Jerry Lewis. Can you help me to change my recent reservation?

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, we regret to inform you that there is no active reservation found under your name.

USER: That's ok, thank you for checking.

ASSISTANT: Most welcome.