You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I provide assistance to 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 with cancellation of my reservation?

ASSISTANT: Sure, we are here to help you. May I know on which name the ticket has been reserved?

USER: Thank you. I am Sandra Miller.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting. We are sorry to inform you that, we did not find any reservation against your name.

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

ASSISTANT: Thank you for choosing us. Have a nice day.