You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Carol Hall.

ASSISTANT: How may I aid you?

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

ASSISTANT: Sure, I am here to help you out.

USER: Ok.

ASSISTANT: Carol Hall, we haven't found any reservation under your name in our database.

USER: That's ok. Thank you, have a good day.

ASSISTANT: Thank you for approaching us.