You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Due to climatic condition, I want you to change my reservation?

ASSISTANT: May I know your name please?

USER: My name is Jason Mitchell.

ASSISTANT: Sorry, no reservation had been found on your name.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you for visiting us.Have a nice day.