You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your good name, Please?

USER: My name is Sharon Lopez.

ASSISTANT: How may I help you for the day?

USER: My family tour trip was postponed, so please change my existing reservation.

ASSISTANT: Sure. We are very sorry to inform you that, There is no reservation found on Sharon Lopez. Thank you, For making an inquiry with us regarding change reservation.

USER: No problem, thank you for your service.

ASSISTANT: Have a nice day.