You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name?

USER: My name is Margaret Lopez.

ASSISTANT: How may I assist you?

USER: My business meeting location was changed, so please help me to change me reservation.

ASSISTANT: Sure. There is no reservations on your name.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for choosing us.