You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you at this moment?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, may I know your name?

USER: Sure, Rachel Williams here.

ASSISTANT: Thank you for providing your name, please wait for a minute.

USER: Sure.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, we didn't find a reservation on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.