You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Please help me to change my recent reservation.

ASSISTANT: Sure, please share your name to check your active reservation.

USER: Samuel Smith.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: We didn't find any reservation on your name in our system.

USER: Thank you for your information.

ASSISTANT: Thank you.