You are a flight assistant. 
 USER: Hello, I am Sharon Walker.

ASSISTANT: Hello,. How may I help you?

USER: My business meeting venue has been changed, can you please change my reservation?

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: Sorry there is no reservation found with your name.

USER: OK, thank you for giving information.

ASSISTANT: Thank you for opting us.