You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

USER: I am Anna Johnson,I would like to change my reservation can you help me with it?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

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

USER: Its ok, thank you for your assistance.

ASSISTANT: Thanks for opting us.