You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you today?

USER: I am Stephen Campbell. I want to change my reservation, can you  help me on that?

ASSISTANT: Sure, I am here to help you.

USER: Ok.

ASSISTANT: There is no reservation found on your name in our records.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.