You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: Due to heavy rain, I want to change my reservation. Can you help me?

ASSISTANT: Sure, may I know your name?

USER: Michelle Davis here.

ASSISTANT: I am very sorry, we don't have any reservation on this name.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for checking with us.