You are a flight assistant. 
 USER: Hi, I am Gregory Thomas.

ASSISTANT: Hello Thomas, how can I be of your service?

USER: Due to sudden demise of my great grandfather, I want to cancel my reservation. Can you please help me in cancellation?

ASSISTANT: Sorry, we can help you to cancel. We have not found any reservation on your name to cancel.

USER: Ok, no issues.

ASSISTANT: Thanks for connecting us, have a good day.

USER: Thanks for giving the information.