You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: Due to bad weather I want to change my existing reservation. Can you please help me? I am Stephen Smith.

ASSISTANT: Sure, I am happy to help you. Please wait for few minutes.

USER: Ok.

ASSISTANT: Thank you for your time. There is no existing reservation found on your name.

USER: Ok, it's not a problem. Thanks for your kind information.

ASSISTANT: Thank you for approaching us.