You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you today?

USER: My name is Edward Hall, I want to change my reservation.

ASSISTANT: OK, please wait for a moment so that I can get back to you.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: OK.

ASSISTANT: Sorry, there is no reservation found on your name. Thank you and have a great day.

USER: Thank you for the information.