You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Donna Walker. There is a meeting in JFK, but the snowfall in JFK is very heavy, so I want to cancel my reservation.

ASSISTANT: Donna Walker, can I ask your travel dates you are planning?

USER: There is previous reservation, so please cancel my reservation.

ASSISTANT: Ok, let me check with it for a moment please.

USER: Ok.

ASSISTANT: Sorry Donna Walker, we couldn't find any reservation by your name.

USER: That's ok, thanks for your help.

ASSISTANT: Sorry for the inconvenience. Keep visiting us again. Thank you for reaching us.