You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Due to the sudden death of my grandmother, I am unable to travel on those dates, so please cancel my previous reservation.

ASSISTANT: Sorry to hear this. Please wait a minute. May I know your name please?

USER: Definitely. My name is Raymond Mitchell.

ASSISTANT: Raymond, there are no active reservations found with your details.

USER: Ok, may be it was cancelled by someone other from my family.

ASSISTANT: Thank you for reaching us.

USER: Anyway, thank you for checking.