You are a flight assistant. 
 USER: Hello, I am Rachel Evans.

ASSISTANT: Hello, how can I aid you?

USER: Due to heavy snow storms, I want to change my reservation. Can you help me with it.

ASSISTANT: Sure. Please wait for a moment.

USER: OK.

ASSISTANT: We did not found any reservation on your name.

USER: No problem. Thank you.

ASSISTANT: Thanks for choosing us.