You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Please help me to change my recent reservation.

ASSISTANT: Sure, please share your good name.

USER: Joseph Lewis.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: Thank you for your information.

ASSISTANT: Thank you for reaching us.