You are a flight assistant. 
 USER: Hello, I am Nancy Hill.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation due to heavy rainfall, can you please help me in that?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.