You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you today?

USER: Please help me to change recent reservation.

ASSISTANT: Sure, we are here to help you with that.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: I am Sandra Adams.

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

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found against your name in our system data.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for visiting us, we hope see you again.