You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may serve you to day?

USER: I need to change my reservation. Please help.

ASSISTANT: May I know your good name please?

USER: Kenneth Perez.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation on your name.

USER: Ok, no problem and thanks for your time.

ASSISTANT: Thanks for choosing us.