You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I help you today?

USER: I am Carol Harris, I already have a reservation now I want to change it.

ASSISTANT: OK, thank you. Can you please wait for while, I will check the details and get back to you soon.

USER: Sure.

ASSISTANT: Thank you for waiting. We have not found any reservation on your name. Do you want to know anything more about us?

USER: Thank you for the information.

ASSISTANT: Thank you.