You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Donald Green here.

ASSISTANT: Green, how can I help you today?

USER: I want to cancel my ticket due to heavy floods in my place.

ASSISTANT: Sure, I am here to help you. please wait for a while.

USER: Ok.

ASSISTANT: Sorry Green, I did not find  any reservation under your name.

USER: It's ok, thank you.

ASSISTANT: Most welcome, have a nice day.