You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I support you?

USER: Please change my existing reservation.

ASSISTANT: Sure, I will help you. May I know your good name?

USER: I am Amy Smith.

ASSISTANT: Please, wait.

USER: Sure.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: Thank you.

ASSISTANT: Thank you for choosing us.