You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to cancel my recent reservation, due to sudden sickness to my grand mother. Can you help me with cancellation?

ASSISTANT: Sure. I will help you. May I know your name?

USER: You can check the reservation on the name of William Lewis.

ASSISTANT: Sorry, no reservation found on your name.

USER: That's Ok, not an issue.

ASSISTANT: Thank you for approaching us.

USER: Thanks for your assistance.