You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: Due to having heavy snow-storm, my dance competition was postponed. For that I want to change the existent reservation.

ASSISTANT: May I know your name?

USER: My name is James Moore.

ASSISTANT: There is no reservation found with your name.

USER: Ok. Thank you for your service.

ASSISTANT: Thank you.