You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: I am Rachel White here. I would like to change my reservation which I have done last week. Can you please help me to change my reservation?

ASSISTANT: Sure, I am here to help you. Please wait for a moment.

USER: Ok, sure.

ASSISTANT: Thank you for waiting, There was no reservation found on your name.

USER: Ok, fine. Thank you for the information.

ASSISTANT: Thank you for reaching us.