You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,. How can I assist you?

USER: I am unable to travel to airport to board my flight due to severe accident in my way to airport. Can you help me in cancellation?

ASSISTANT: Please provide your name?

USER: I am Samantha Green.

ASSISTANT: Ok. No reservation exists.

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

ASSISTANT: Thank you.