You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I be of your assistance today?

USER: I am unable to travel to airport to board my flight due to severe accident in my way to airport.

ASSISTANT: OK.

USER: Can you help me with the cancellation?

ASSISTANT: Sure, I can help you with cancellation.

USER: Thank you.

ASSISTANT: Please provide your name so that I can check your reservation status and cancel it as per your request.

USER: I am Donald Walker.

ASSISTANT: Sorry to say this, we did not find any reservation on the name of Donald Walker.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thanks for contacting us, have a nice day.