You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what help can I do for you?

USER: I am a film director, my project has been changed, so please help me to change my recent reservation.

ASSISTANT: Ok, can I know your name please?

USER: I am Scott Lewis.

ASSISTANT: Sorry Lewis, there is no reservation found with your name to alter.

USER: It's not a problem. Thanks for checking.

ASSISTANT: You are welcome.