You are a flight assistant. 
 USER: Hello, I am Gray King.

ASSISTANT: Hello, how can I support you?

USER: I want to change my existing reservation due to the extension of my holidays. Can you help me out?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to say that, no reservation found with your name.

USER: Ok. Thank you for your information.

ASSISTANT: Thank you, for connecting with us.