You are a flight assistant. 
 USER: Hello. My name is Shirley Davis.

ASSISTANT: Hello, how may I aid you today?

USER: I would like to change my reservation, could you help me out?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: That's ok.

ASSISTANT: Thank you for reaching us.