You are a flight assistant. 
 USER: Hi. I need to change my reservation.

ASSISTANT: Hello,.

USER: Please, help me.

ASSISTANT: Sure, may I know your good name?

USER: My name is William White.

ASSISTANT: Please, wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, no reservation was found with your name.

USER: No problem.

ASSISTANT: Thank you, for choosing us.

USER: Thanks for the information.