You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Cynthia White. I want to change my reservation, can you help me?

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, Cynthia White I did not find any reservation found ion your name to change.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.