You are a flight assistant. 
 USER: Hello, I am Anna Collins.

ASSISTANT: Hello, How can I assist you?

USER: Due to emergency problem with my grandfather I need to cancel my reservation. Can you please cancel my reservation?

ASSISTANT: Sure,. Wait a moment, I will check and revert you.

USER: Sure.

ASSISTANT: Thank you for waiting. We are sorry, we did not find any reservation with your name.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for approaching us. Have a beautiful day.