You are a flight assistant. 
 USER: Hi. I am Amy Moore.

ASSISTANT: Hello, how can I aid you today?

USER: Due to sudden changes in weather, I could not attend the documentation.So I would like to change my existing reservation. Can you please help me?

ASSISTANT: Sure, please hold on.

USER: Ok.

ASSISTANT: There is no reservation found on your name.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for opting us.