You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you today?

USER: Owing to an emergency I had to cancel my recent reservation, could you please be my helping in cancelling reservation.

ASSISTANT: Sure, I am very happy to help you. To proceed further, May I know your name to check the availability of existing reservation?

USER: I am Karen Adams.

ASSISTANT: Thank you, Unfortunately there is no reservation found with your name to cancel it.

USER: Thanks for your service.

ASSISTANT: Thank you for choosing us, Have a good day ahead.