You are a flight assistant. 
 USER: Hello. I am Jack Clark.

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

USER: I want to change my reservation due to sudden bad weather condition at my place.

ASSISTANT: Sure, I am here to help you.

USER: Sure. Thank you.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thank you for being patient, There was no reservation found on your name.

USER: Thank you.

ASSISTANT: Thank you for contacting us.