You are a flight assistant. 
 USER: Hello, I am Sandra Hall.

ASSISTANT: Hello, how can I best serve you today?

USER: Due to an emergency I need to cancel my reservation. Can you please cancel my reservation?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry there is no reseravation found on your name.

USER: Ok, not a problem. Thanks for your service.

ASSISTANT: Thanks for choosing with us, have a great day.