You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Would it be possible to change my recent reservation?

ASSISTANT: Sure, may I know your name please?

USER: Sure, I am Benjamin Parker.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you, there is no active reservation found with your name in our records.

USER: It's ok, thanks for your information.

ASSISTANT: My pleasure.