You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you please help me to change my existing reservation?

ASSISTANT: Sure, I am here to help you with your concern. May I know your name to check with the reservation status?

USER: My name is Jeffrey Wilson.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. Jeffrey Wilson, sorry there is no active reservation found under your name to amend.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for reaching us.