You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be a help for you?

USER: Myself Gregory Robinson. For some issues I want to change my reservation, can you please help me?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: It's ok. Thank you for the information.

ASSISTANT: Thank you for contacting us.