You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: My campaigning is postponed due to climatic conditions. so, please change my existing reservation.

ASSISTANT: Sure, please wait a minute, I will check and revert you.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no reservation found. Can I have your good name to continue further details.

USER: I am Shirley Johnson. Thanks for your information.

ASSISTANT: Thank you, for approaching us.

USER: Ok.